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(30*75)-(30*50)=x
We move all terms to the left:
(30*75)-(30*50)-(x)=0
We add all the numbers together, and all the variables
-x+2250-1500=0
We add all the numbers together, and all the variables
-1x+750=0
We move all terms containing x to the left, all other terms to the right
-x=-750
x=-750/-1
x=+750
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