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3x+12=10x+15
We move all terms to the left:
3x+12-(10x+15)=0
We get rid of parentheses
3x-10x-15+12=0
We add all the numbers together, and all the variables
-7x-3=0
We move all terms containing x to the left, all other terms to the right
-7x=3
x=3/-7
x=-3/7
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