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350=55x+20
We move all terms to the left:
350-(55x+20)=0
We get rid of parentheses
-55x-20+350=0
We add all the numbers together, and all the variables
-55x+330=0
We move all terms containing x to the left, all other terms to the right
-55x=-330
x=-330/-55
x=+6
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