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4x+3=15x+15
We move all terms to the left:
4x+3-(15x+15)=0
We get rid of parentheses
4x-15x-15+3=0
We add all the numbers together, and all the variables
-11x-12=0
We move all terms containing x to the left, all other terms to the right
-11x=12
x=12/-11
x=-1+1/11
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