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8x-3(2x=7)=-19
We move all terms to the left:
8x-3(2x-(7))=0
We multiply parentheses
8x-6x+21=0
We add all the numbers together, and all the variables
2x+21=0
We move all terms containing x to the left, all other terms to the right
2x=-21
x=-21/2
x=-10+1/2
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