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80=3x+2.4x
We move all terms to the left:
80-(3x+2.4x)=0
We add all the numbers together, and all the variables
-(+5.4x)+80=0
We get rid of parentheses
-5.4x+80=0
We move all terms containing x to the left, all other terms to the right
-5.4x=-80
x=-80/-5.4
x=14+3.14285714286/3.85714285714
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