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x-3(10x+4)=12
We move all terms to the left:
x-3(10x+4)-(12)=0
We multiply parentheses
x-30x-12-12=0
We add all the numbers together, and all the variables
-29x-24=0
We move all terms containing x to the left, all other terms to the right
-29x=24
x=24/-29
x=-24/29
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