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15-3(x+8)-15=-3
We move all terms to the left:
15-3(x+8)-15-(-3)=0
We add all the numbers together, and all the variables
-3(x+8)+3=0
We multiply parentheses
-3x-24+3=0
We add all the numbers together, and all the variables
-3x-21=0
We move all terms containing x to the left, all other terms to the right
-3x=21
x=21/-3
x=-7
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