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4x-40=-2x+7*2
We move all terms to the left:
4x-40-(-2x+7*2)=0
We add all the numbers together, and all the variables
4x-(-2x+14)-40=0
We get rid of parentheses
4x+2x-14-40=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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