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10x=30x+300
We move all terms to the left:
10x-(30x+300)=0
We get rid of parentheses
10x-30x-300=0
We add all the numbers together, and all the variables
-20x-300=0
We move all terms containing x to the left, all other terms to the right
-20x=300
x=300/-20
x=-15
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