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15x+3(13-2x)=18
We move all terms to the left:
15x+3(13-2x)-(18)=0
We add all the numbers together, and all the variables
15x+3(-2x+13)-18=0
We multiply parentheses
15x-6x+39-18=0
We add all the numbers together, and all the variables
9x+21=0
We move all terms containing x to the left, all other terms to the right
9x=-21
x=-21/9
x=-2+1/3
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