0.4r-7=-0.3r+2.8

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Solution for 0.4r-7=-0.3r+2.8 equation: 


Simplifying
0.4r + -7 = -0.3r + 2.8

Reorder the terms:
-7 + 0.4r = -0.3r + 2.8

Reorder the terms:
-7 + 0.4r = 2.8 + -0.3r

Solving
-7 + 0.4r = 2.8 + -0.3r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '0.3r' to each side of the equation.
-7 + 0.4r + 0.3r = 2.8 + -0.3r + 0.3r

Combine like terms: 0.4r + 0.3r = 0.7r
-7 + 0.7r = 2.8 + -0.3r + 0.3r

Combine like terms: -0.3r + 0.3r = 0.0
-7 + 0.7r = 2.8 + 0.0
-7 + 0.7r = 2.8

Add '7' to each side of the equation.
-7 + 7 + 0.7r = 2.8 + 7

Combine like terms: -7 + 7 = 0
0 + 0.7r = 2.8 + 7
0.7r = 2.8 + 7

Combine like terms: 2.8 + 7 = 9.8
0.7r = 9.8

Divide each side by '0.7'.
r = 14

Simplifying
r = 14

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