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(5x-20)+(2x+10)=18
We move all terms to the left:
(5x-20)+(2x+10)-(18)=0
We get rid of parentheses
5x+2x-20+10-18=0
We add all the numbers together, and all the variables
7x-28=0
We move all terms containing x to the left, all other terms to the right
7x=28
x=28/7
x=4
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