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150=30+20x
We move all terms to the left:
150-(30+20x)=0
We add all the numbers together, and all the variables
-(20x+30)+150=0
We get rid of parentheses
-20x-30+150=0
We add all the numbers together, and all the variables
-20x+120=0
We move all terms containing x to the left, all other terms to the right
-20x=-120
x=-120/-20
x=+6
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