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(10x-4)-(18+3x)=20
We move all terms to the left:
(10x-4)-(18+3x)-(20)=0
We add all the numbers together, and all the variables
(10x-4)-(3x+18)-20=0
We get rid of parentheses
10x-3x-4-18-20=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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