3a+30-12=75 how do you do this
3a+30-12=75
you combine 30-12 and get:
3a+18=75
then you subtract 18 from both sides:
3a-18=75-18
and get:
3a=57
then divide both sides by 3
3a/3=57/3
a=19
So 'a' equals 19
The previous answer is correct, but this subject is NOT geometry.
To solve the equation 3a + 30 - 12 = 75, follow these steps:
Step 1: Simplify the equation by combining like terms. In this case, combine the constants 30 and -12 to get 18. The equation becomes:
3a + 18 = 75
Step 2: Isolate the variable term by undoing any addition or subtraction. Since 18 is added to 3a, we will subtract 18 from both sides of the equation to cancel it out:
3a = 75 - 18
3a = 57
Step 3: Solve for the variable by undoing any multiplication or division. In this case, 3 is multiplied by a, so we will divide both sides of the equation by 3 to isolate a:
3a/3 = 57/3
a = 19
Therefore, the solution to the equation is a = 19.