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4x-12=8x+3
We move all terms to the left:
4x-12-(8x+3)=0
We get rid of parentheses
4x-8x-3-12=0
We add all the numbers together, and all the variables
-4x-15=0
We move all terms containing x to the left, all other terms to the right
-4x=15
x=15/-4
x=-3+3/4
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