x + (-9) = -5
x = -5 + 9
x = 4
but why does X = -5 +9
If A = B, then that implies that:
A + a = B + a
for any number a.
X + (-9) = -5
then choosing a = 9 we get:
X + (-9) + 9 = -5 + 9
Since (-9) + 9 = 0 we have
X = -5 + 9
You need to get the unknown on one side of the equation and the knowns on the other side. To do that you subtract -9 from the left side, change the sign and add it to the right side.
i still dont get it
ii still dont get it
Let's try this.
Remember, you can do anything to an equation as long as you do it to both sides. We want to get X (the unknown) on one side and the numbers on the other with the = sign between.
So, remove the parentheses first to obtain (remember that a + sign in front of the parentheses leaves the sign of the numbers inside the parentheses unchanged--conversely, a - sign in front of the parentheses changes all the signs inside the parentheses when the parentheses are removed).
X - 9 = -5
Now add +0 to both sides.
X-9+9 = -5+9
Now combine the numbers
-9 and +9 add to zero on the left while -5 and +9 add to +4 on the right.
X = +4.
That is the way to move anything from one side to the other. If you wish to move a + number simply subtract that number from both sides; if you wish to move a - number simply add that number to both sides. An easier way is to move anything from one side to the other by moving it and changing the sign.
I hope this helps.
yes thanx now i get it
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