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3x+8-5x-5=2x+12-7x
We move all terms to the left:
3x+8-5x-5-(2x+12-7x)=0
We add all the numbers together, and all the variables
3x-5x-(-5x+12)+8-5=0
We add all the numbers together, and all the variables
-2x-(-5x+12)+3=0
We get rid of parentheses
-2x+5x-12+3=0
We add all the numbers together, and all the variables
3x-9=0
We move all terms containing x to the left, all other terms to the right
3x=9
x=9/3
x=3
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