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20x=+15-5x
We move all terms to the left:
20x-(+15-5x)=0
We add all the numbers together, and all the variables
20x-(-5x+15)=0
We get rid of parentheses
20x+5x-15=0
We add all the numbers together, and all the variables
25x-15=0
We move all terms containing x to the left, all other terms to the right
25x=15
x=15/25
x=3/5
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