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3(4-x)=18x+15
We move all terms to the left:
3(4-x)-(18x+15)=0
We add all the numbers together, and all the variables
3(-1x+4)-(18x+15)=0
We multiply parentheses
-3x-(18x+15)+12=0
We get rid of parentheses
-3x-18x-15+12=0
We add all the numbers together, and all the variables
-21x-3=0
We move all terms containing x to the left, all other terms to the right
-21x=3
x=3/-21
x=-1/7
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