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-18=0.5x-0.8x
We move all terms to the left:
-18-(0.5x-0.8x)=0
We add all the numbers together, and all the variables
-(-0.3x)-18=0
We get rid of parentheses
0.3x-18=0
We move all terms containing x to the left, all other terms to the right
0.3x=18
x=18/0.3
x=60
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