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28.8=7.2x
We move all terms to the left:
28.8-(7.2x)=0
We add all the numbers together, and all the variables
-(+7.2x)+28.8=0
We get rid of parentheses
-7.2x+28.8=0
We move all terms containing x to the left, all other terms to the right
-7.2x=-28.8
x=-28.8/-7.2
x=+4
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