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-3x+5(2x+1)=-16
We move all terms to the left:
-3x+5(2x+1)-(-16)=0
We add all the numbers together, and all the variables
-3x+5(2x+1)+16=0
We multiply parentheses
-3x+10x+5+16=0
We add all the numbers together, and all the variables
7x+21=0
We move all terms containing x to the left, all other terms to the right
7x=-21
x=-21/7
x=-3
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