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75x=100x+-300
We move all terms to the left:
75x-(100x+-300)=0
We add all the numbers together, and all the variables
75x-(100x-300)=0
We get rid of parentheses
75x-100x+300=0
We add all the numbers together, and all the variables
-25x+300=0
We move all terms containing x to the left, all other terms to the right
-25x=-300
x=-300/-25
x=+12
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