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-5(4x+9)+13x=-87
We move all terms to the left:
-5(4x+9)+13x-(-87)=0
We add all the numbers together, and all the variables
13x-5(4x+9)+87=0
We multiply parentheses
13x-20x-45+87=0
We add all the numbers together, and all the variables
-7x+42=0
We move all terms containing x to the left, all other terms to the right
-7x=-42
x=-42/-7
x=+6
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