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-100-3x=80+6x
We move all terms to the left:
-100-3x-(80+6x)=0
We add all the numbers together, and all the variables
-3x-(6x+80)-100=0
We get rid of parentheses
-3x-6x-80-100=0
We add all the numbers together, and all the variables
-9x-180=0
We move all terms containing x to the left, all other terms to the right
-9x=180
x=180/-9
x=-20
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