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15-3x=x+3+x
We move all terms to the left:
15-3x-(x+3+x)=0
We add all the numbers together, and all the variables
-3x-(2x+3)+15=0
We get rid of parentheses
-3x-2x-3+15=0
We add all the numbers together, and all the variables
-5x+12=0
We move all terms containing x to the left, all other terms to the right
-5x=-12
x=-12/-5
x=2+2/5
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