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300=10x+75
We move all terms to the left:
300-(10x+75)=0
We get rid of parentheses
-10x-75+300=0
We add all the numbers together, and all the variables
-10x+225=0
We move all terms containing x to the left, all other terms to the right
-10x=-225
x=-225/-10
x=22+1/2
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