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2x+3-4x+5=2x+8-7x+12
We move all terms to the left:
2x+3-4x+5-(2x+8-7x+12)=0
We add all the numbers together, and all the variables
2x-4x-(-5x+20)+3+5=0
We add all the numbers together, and all the variables
-2x-(-5x+20)+8=0
We get rid of parentheses
-2x+5x-20+8=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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