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50x+9000-90x=50*100
We move all terms to the left:
50x+9000-90x-(50*100)=0
We add all the numbers together, and all the variables
50x-90x+9000-5000=0
We add all the numbers together, and all the variables
-40x+4000=0
We move all terms containing x to the left, all other terms to the right
-40x=-4000
x=-4000/-40
x=+100
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