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13x-5(-3x-9)=-51
We move all terms to the left:
13x-5(-3x-9)-(-51)=0
We add all the numbers together, and all the variables
13x-5(-3x-9)+51=0
We multiply parentheses
13x+15x+45+51=0
We add all the numbers together, and all the variables
28x+96=0
We move all terms containing x to the left, all other terms to the right
28x=-96
x=-96/28
x=-3+3/7
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