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300=15+5x
We move all terms to the left:
300-(15+5x)=0
We add all the numbers together, and all the variables
-(5x+15)+300=0
We get rid of parentheses
-5x-15+300=0
We add all the numbers together, and all the variables
-5x+285=0
We move all terms containing x to the left, all other terms to the right
-5x=-285
x=-285/-5
x=+57
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