2.89-2.7r-.8r=1.31

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Solution for 2.89-2.7r-.8r=1.31 equation: 


Simplifying
2.89 + -2.7r + -0.8r = 1.31

Combine like terms: -2.7r + -0.8r = -3.5r
2.89 + -3.5r = 1.31

Solving
2.89 + -3.5r = 1.31

Solving for variable 'r'.

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

Add '-2.89' to each side of the equation.
2.89 + -2.89 + -3.5r = 1.31 + -2.89

Combine like terms: 2.89 + -2.89 = 0.00
0.00 + -3.5r = 1.31 + -2.89
-3.5r = 1.31 + -2.89

Combine like terms: 1.31 + -2.89 = -1.58
-3.5r = -1.58

Divide each side by '-3.5'.
r = 0.4514285714

Simplifying
r = 0.4514285714

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