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(5x-6)+(5x-4)=140
We move all terms to the left:
(5x-6)+(5x-4)-(140)=0
We get rid of parentheses
5x+5x-6-4-140=0
We add all the numbers together, and all the variables
10x-150=0
We move all terms containing x to the left, all other terms to the right
10x=150
x=150/10
x=15
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