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6x-20=4x+90
We move all terms to the left:
6x-20-(4x+90)=0
We get rid of parentheses
6x-4x-90-20=0
We add all the numbers together, and all the variables
2x-110=0
We move all terms containing x to the left, all other terms to the right
2x=110
x=110/2
x=55
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