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50x+90=90x-150
We move all terms to the left:
50x+90-(90x-150)=0
We get rid of parentheses
50x-90x+150+90=0
We add all the numbers together, and all the variables
-40x+240=0
We move all terms containing x to the left, all other terms to the right
-40x=-240
x=-240/-40
x=+6
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