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18-2(x+7)=8x-20-2/2
We move all terms to the left:
18-2(x+7)-(8x-20-2/2)=0
We add all the numbers together, and all the variables
-2(x+7)-(8x-21)+18=0
We multiply parentheses
-2x-(8x-21)-14+18=0
We get rid of parentheses
-2x-8x+21-14+18=0
We add all the numbers together, and all the variables
-10x+25=0
We move all terms containing x to the left, all other terms to the right
-10x=-25
x=-25/-10
x=2+1/2
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