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3(5x-15)=138+3x
We move all terms to the left:
3(5x-15)-(138+3x)=0
We add all the numbers together, and all the variables
3(5x-15)-(3x+138)=0
We multiply parentheses
15x-(3x+138)-45=0
We get rid of parentheses
15x-3x-138-45=0
We add all the numbers together, and all the variables
12x-183=0
We move all terms containing x to the left, all other terms to the right
12x=183
x=183/12
x=15+1/4
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