2(r+1.2)-4r=3.9

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Solution for 2(r+1.2)-4r=3.9 equation: 



2(r+1.2)-4r=3.9

We move all terms to the left:

2(r+1.2)-4r-(3.9)=0

We add all the numbers together, and all the variables

-4r+2(r+1.2)-3.9=0

We multiply parentheses

-4r+2r+2.4-3.9=0

We add all the numbers together, and all the variables

-2r-1.5=0

We move all terms containing r to the left, all other terms to the right

-2r=1.5

r=1.5/-2

r=-1/1.3333333333333

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