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0.03x+18=0.09x
We move all terms to the left:
0.03x+18-(0.09x)=0
We add all the numbers together, and all the variables
0.03x-(+0.09x)+18=0
We get rid of parentheses
0.03x-0.09x+18=0
We add all the numbers together, and all the variables
-0.06x+18=0
We move all terms containing x to the left, all other terms to the right
-0.06x=-18
x=-18/-0.06
x=+300
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