0.4-0.2r=r+4

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Solution for 0.4-0.2r=r+4 equation:


0.4-0.2r=r+4

We simplify the equation to the form, which is simple to understand 
0.4-0.2r=r+4

We move all terms containing r to the left and all other terms to the right. 
-0.2r-1r=+4-0.4

We simplify left and right side of the equation. 
-1.2r=+3.6

We divide both sides of the equation by -1.2 to get r. 
r=-3

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