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4x+3+5x=3x-15
We move all terms to the left:
4x+3+5x-(3x-15)=0
We add all the numbers together, and all the variables
9x-(3x-15)+3=0
We get rid of parentheses
9x-3x+15+3=0
We add all the numbers together, and all the variables
6x+18=0
We move all terms containing x to the left, all other terms to the right
6x=-18
x=-18/6
x=-3
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