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5x+12=15x-3
We move all terms to the left:
5x+12-(15x-3)=0
We get rid of parentheses
5x-15x+3+12=0
We add all the numbers together, and all the variables
-10x+15=0
We move all terms containing x to the left, all other terms to the right
-10x=-15
x=-15/-10
x=1+1/2
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