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8x+7(-9x-4)=247
We move all terms to the left:
8x+7(-9x-4)-(247)=0
We multiply parentheses
8x-63x-28-247=0
We add all the numbers together, and all the variables
-55x-275=0
We move all terms containing x to the left, all other terms to the right
-55x=275
x=275/-55
x=-5
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