R-(.20R)=81

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Solution for R-(.20R)=81 equation: 


Simplifying
R + -1(0.20R) = 81

Remove parenthesis around (0.20R)
R + -1 * 0.20R = 81

Multiply -1 * 0.20
R + -0.2R = 81

Combine like terms: R + -0.2R = 0.8R
0.8R = 81

Solving
0.8R = 81

Solving for variable 'R'.

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

Divide each side by '0.8'.
R = 101.25

Simplifying
R = 101.25

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