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28-13=3(x-8)
We move all terms to the left:
28-13-(3(x-8))=0
We add all the numbers together, and all the variables
-(3(x-8))+15=0
We calculate terms in parentheses: -(3(x-8)), so:We get rid of parentheses
3(x-8)
We multiply parentheses
3x-24
Back to the equation:
-(3x-24)
-3x+24+15=0
We add all the numbers together, and all the variables
-3x+39=0
We move all terms containing x to the left, all other terms to the right
-3x=-39
x=-39/-3
x=+13
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