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