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6x+3x+2+2x+7=40
We move all terms to the left:
6x+3x+2+2x+7-(40)=0
We add all the numbers together, and all the variables
11x-31=0
We move all terms containing x to the left, all other terms to the right
11x=31
x=31/11
x=2+9/11
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