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(5x+140)=90
We move all terms to the left:
(5x+140)-(90)=0
We get rid of parentheses
5x+140-90=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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