Posted by katie on Friday, October 1, 2010 at 10:39pm.
5x-10-2x+7=0
3x-3=0
3x=3
x=1
5x-10=2x-7
Add 10 to both sides.
5x=2x+3
Subtract 2x from both sides.
3x=3
Divide both sides by 3.
x=1
This way is the more common method although Emily did get the correct answer.
I'm in 7th grade too but I studied this last year so:
5x-10=2x-7
-2x -2x
3x-10= -7
+10 +10 (because -10 and -7 are -)
3x = 3 Then divide out
x=1
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