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x-300=0.5x-300+100
We move all terms to the left:
x-300-(0.5x-300+100)=0
We add all the numbers together, and all the variables
x-(0.5x-200)-300=0
We get rid of parentheses
x-0.5x+200-300=0
We add all the numbers together, and all the variables
0.5x-100=0
We move all terms containing x to the left, all other terms to the right
0.5x=100
x=100/0.5
x=200
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