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5x-40=8x-90
We move all terms to the left:
5x-40-(8x-90)=0
We get rid of parentheses
5x-8x+90-40=0
We add all the numbers together, and all the variables
-3x+50=0
We move all terms containing x to the left, all other terms to the right
-3x=-50
x=-50/-3
x=16+2/3
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