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3+5x=-12+x
We move all terms to the left:
3+5x-(-12+x)=0
We add all the numbers together, and all the variables
5x-(x-12)+3=0
We get rid of parentheses
5x-x+12+3=0
We add all the numbers together, and all the variables
4x+15=0
We move all terms containing x to the left, all other terms to the right
4x=-15
x=-15/4
x=-3+3/4
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