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9x-30=10x-15
We move all terms to the left:
9x-30-(10x-15)=0
We get rid of parentheses
9x-10x+15-30=0
We add all the numbers together, and all the variables
-1x-15=0
We move all terms containing x to the left, all other terms to the right
-x=15
x=15/-1
x=-15
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