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150=30+0.12x
We move all terms to the left:
150-(30+0.12x)=0
We add all the numbers together, and all the variables
-(0.12x+30)+150=0
We get rid of parentheses
-0.12x-30+150=0
We add all the numbers together, and all the variables
-0.12x+120=0
We move all terms containing x to the left, all other terms to the right
-0.12x=-120
x=-120/-0.12
x=+1000
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