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50x=-100x+300
We move all terms to the left:
50x-(-100x+300)=0
We get rid of parentheses
50x+100x-300=0
We add all the numbers together, and all the variables
150x-300=0
We move all terms containing x to the left, all other terms to the right
150x=300
x=300/150
x=2
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