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5x-7x+15=3x+30
We move all terms to the left:
5x-7x+15-(3x+30)=0
We add all the numbers together, and all the variables
-2x-(3x+30)+15=0
We get rid of parentheses
-2x-3x-30+15=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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