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300-10x=100+10x
We move all terms to the left:
300-10x-(100+10x)=0
We add all the numbers together, and all the variables
-10x-(10x+100)+300=0
We get rid of parentheses
-10x-10x-100+300=0
We add all the numbers together, and all the variables
-20x+200=0
We move all terms containing x to the left, all other terms to the right
-20x=-200
x=-200/-20
x=+10
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