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X+3-7X=40+7
We move all terms to the left:
X+3-7X-(40+7)=0
We add all the numbers together, and all the variables
X-7X+3-47=0
We add all the numbers together, and all the variables
-6X-44=0
We move all terms containing X to the left, all other terms to the right
-6X=44
X=44/-6
X=-7+1/3
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