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300=5x-2x-30
We move all terms to the left:
300-(5x-2x-30)=0
We add all the numbers together, and all the variables
-(3x-30)+300=0
We get rid of parentheses
-3x+30+300=0
We add all the numbers together, and all the variables
-3x+330=0
We move all terms containing x to the left, all other terms to the right
-3x=-330
x=-330/-3
x=+110
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