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16+2x=-5x-12
We move all terms to the left:
16+2x-(-5x-12)=0
We get rid of parentheses
2x+5x+12+16=0
We add all the numbers together, and all the variables
7x+28=0
We move all terms containing x to the left, all other terms to the right
7x=-28
x=-28/7
x=-4
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