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30X+15X=25+17
We move all terms to the left:
30X+15X-(25+17)=0
We add all the numbers together, and all the variables
30X+15X-42=0
We add all the numbers together, and all the variables
45X-42=0
We move all terms containing X to the left, all other terms to the right
45X=42
X=42/45
X=14/15
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