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28.8=12x+36x
We move all terms to the left:
28.8-(12x+36x)=0
We add all the numbers together, and all the variables
-(+48x)+28.8=0
We get rid of parentheses
-48x+28.8=0
We move all terms containing x to the left, all other terms to the right
-48x=-28.8
x=-28.8/-48
x=6/10
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