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10x=20x-4
We move all terms to the left:
10x-(20x-4)=0
We get rid of parentheses
10x-20x+4=0
We add all the numbers together, and all the variables
-10x+4=0
We move all terms containing x to the left, all other terms to the right
-10x=-4
x=-4/-10
x=2/5
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