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8x+5(-5x+21)=6
We move all terms to the left:
8x+5(-5x+21)-(6)=0
We multiply parentheses
8x-25x+105-6=0
We add all the numbers together, and all the variables
-17x+99=0
We move all terms containing x to the left, all other terms to the right
-17x=-99
x=-99/-17
x=5+14/17
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