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-4x-7(-3x-9)=249
We move all terms to the left:
-4x-7(-3x-9)-(249)=0
We multiply parentheses
-4x+21x+63-249=0
We add all the numbers together, and all the variables
17x-186=0
We move all terms containing x to the left, all other terms to the right
17x=186
x=186/17
x=10+16/17
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