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5x+4(4x+2)=-139
We move all terms to the left:
5x+4(4x+2)-(-139)=0
We add all the numbers together, and all the variables
5x+4(4x+2)+139=0
We multiply parentheses
5x+16x+8+139=0
We add all the numbers together, and all the variables
21x+147=0
We move all terms containing x to the left, all other terms to the right
21x=-147
x=-147/21
x=-7
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