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x+15=-3x+43
We move all terms to the left:
x+15-(-3x+43)=0
We get rid of parentheses
x+3x-43+15=0
We add all the numbers together, and all the variables
4x-28=0
We move all terms containing x to the left, all other terms to the right
4x=28
x=28/4
x=7
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