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20x-30=10x+20
We move all terms to the left:
20x-30-(10x+20)=0
We get rid of parentheses
20x-10x-20-30=0
We add all the numbers together, and all the variables
10x-50=0
We move all terms containing x to the left, all other terms to the right
10x=50
x=50/10
x=5
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