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7+5=-3x+31
We move all terms to the left:
7+5-(-3x+31)=0
We add all the numbers together, and all the variables
-(-3x+31)+12=0
We get rid of parentheses
3x-31+12=0
We add all the numbers together, and all the variables
3x-19=0
We move all terms containing x to the left, all other terms to the right
3x=19
x=19/3
x=6+1/3
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