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2x+20=4x+50
We move all terms to the left:
2x+20-(4x+50)=0
We get rid of parentheses
2x-4x-50+20=0
We add all the numbers together, and all the variables
-2x-30=0
We move all terms containing x to the left, all other terms to the right
-2x=30
x=30/-2
x=-15
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