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150=0.9x
We move all terms to the left:
150-(0.9x)=0
We add all the numbers together, and all the variables
-(+0.9x)+150=0
We get rid of parentheses
-0.9x+150=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-150
x=-150/-0.9
x=166+0.59999999999999/0.9
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