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-10-3x=7x+80
We move all terms to the left:
-10-3x-(7x+80)=0
We get rid of parentheses
-3x-7x-80-10=0
We add all the numbers together, and all the variables
-10x-90=0
We move all terms containing x to the left, all other terms to the right
-10x=90
x=90/-10
x=-9
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