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3+3x=-x+43
We move all terms to the left:
3+3x-(-x+43)=0
We add all the numbers together, and all the variables
3x-(-1x+43)+3=0
We get rid of parentheses
3x+1x-43+3=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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