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3(x-5)-8(9+x)=0
We add all the numbers together, and all the variables
3(x-5)-8(x+9)=0
We multiply parentheses
3x-8x-15-72=0
We add all the numbers together, and all the variables
-5x-87=0
We move all terms containing x to the left, all other terms to the right
-5x=87
x=87/-5
x=-17+2/5
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