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8x-5x+140=8x+90
We move all terms to the left:
8x-5x+140-(8x+90)=0
We add all the numbers together, and all the variables
3x-(8x+90)+140=0
We get rid of parentheses
3x-8x-90+140=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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