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8x-(5x+4)=4x-25
We move all terms to the left:
8x-(5x+4)-(4x-25)=0
We get rid of parentheses
8x-5x-4x-4+25=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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