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x-5(2x+3)=84
We move all terms to the left:
x-5(2x+3)-(84)=0
We multiply parentheses
x-10x-15-84=0
We add all the numbers together, and all the variables
-9x-99=0
We move all terms containing x to the left, all other terms to the right
-9x=99
x=99/-9
x=-11
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