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150=2x+90
We move all terms to the left:
150-(2x+90)=0
We get rid of parentheses
-2x-90+150=0
We add all the numbers together, and all the variables
-2x+60=0
We move all terms containing x to the left, all other terms to the right
-2x=-60
x=-60/-2
x=+30
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