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129=-3(5x-8)
We move all terms to the left:
129-(-3(5x-8))=0
We calculate terms in parentheses: -(-3(5x-8)), so:We get rid of parentheses
-3(5x-8)
We multiply parentheses
-15x+24
Back to the equation:
-(-15x+24)
15x-24+129=0
We add all the numbers together, and all the variables
15x+105=0
We move all terms containing x to the left, all other terms to the right
15x=-105
x=-105/15
x=-7
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