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x+15=43+3x
We move all terms to the left:
x+15-(43+3x)=0
We add all the numbers together, and all the variables
x-(3x+43)+15=0
We get rid of parentheses
x-3x-43+15=0
We add all the numbers together, and all the variables
-2x-28=0
We move all terms containing x to the left, all other terms to the right
-2x=28
x=28/-2
x=-14
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