9=R+0.8(10-R)

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Solution for 9=R+0.8(10-R) equation:


Simplifying
9 = R + 0.8(10 + -1R)
9 = R + (10 * 0.8 + -1R * 0.8)
9 = R + (8 + -0.8R)

Reorder the terms:
9 = 8 + R + -0.8R

Combine like terms: R + -0.8R = 0.2R
9 = 8 + 0.2R

Solving
9 = 8 + 0.2R

Solving for variable 'R'.

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

Add '-0.2R' to each side of the equation.
9 + -0.2R = 8 + 0.2R + -0.2R

Combine like terms: 0.2R + -0.2R = 0.0
9 + -0.2R = 8 + 0.0
9 + -0.2R = 8

Add '-9' to each side of the equation.
9 + -9 + -0.2R = 8 + -9

Combine like terms: 9 + -9 = 0
0 + -0.2R = 8 + -9
-0.2R = 8 + -9

Combine like terms: 8 + -9 = -1
-0.2R = -1

Divide each side by '-0.2'.
R = 5

Simplifying
R = 5

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