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4x-40=-2+7*2
We move all terms to the left:
4x-40-(-2+7*2)=0
We add all the numbers together, and all the variables
4x-40-12=0
We add all the numbers together, and all the variables
4x-52=0
We move all terms containing x to the left, all other terms to the right
4x=52
x=52/4
x=13
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