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30=0.75x+12
We move all terms to the left:
30-(0.75x+12)=0
We get rid of parentheses
-0.75x-12+30=0
We add all the numbers together, and all the variables
-0.75x+18=0
We move all terms containing x to the left, all other terms to the right
-0.75x=-18
x=-18/-0.75
x=+24
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