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20x-20+5x-10=4x+20-20
We move all terms to the left:
20x-20+5x-10-(4x+20-20)=0
We add all the numbers together, and all the variables
20x+5x-(+4x)-20-10=0
We add all the numbers together, and all the variables
25x-(+4x)-30=0
We get rid of parentheses
25x-4x-30=0
We add all the numbers together, and all the variables
21x-30=0
We move all terms containing x to the left, all other terms to the right
21x=30
x=30/21
x=1+3/7
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