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12x=10x+300
We move all terms to the left:
12x-(10x+300)=0
We get rid of parentheses
12x-10x-300=0
We add all the numbers together, and all the variables
2x-300=0
We move all terms containing x to the left, all other terms to the right
2x=300
x=300/2
x=150
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