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180=0.3x+0.3x
We move all terms to the left:
180-(0.3x+0.3x)=0
We add all the numbers together, and all the variables
-(+0.6x)+180=0
We get rid of parentheses
-0.6x+180=0
We move all terms containing x to the left, all other terms to the right
-0.6x=-180
x=-180/-0.6
x=+300
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