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-0.15x+91.5=0.5x+20
We move all terms to the left:
-0.15x+91.5-(0.5x+20)=0
We get rid of parentheses
-0.15x-0.5x-20+91.5=0
We add all the numbers together, and all the variables
-0.65x+71.5=0
We move all terms containing x to the left, all other terms to the right
-0.65x=-71.5
x=-71.5/-0.65
x=+110
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