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31=7-4x
We move all terms to the left:
31-(7-4x)=0
We add all the numbers together, and all the variables
-(-4x+7)+31=0
We get rid of parentheses
4x-7+31=0
We add all the numbers together, and all the variables
4x+24=0
We move all terms containing x to the left, all other terms to the right
4x=-24
x=-24/4
x=-6
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