13-20=9R

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Solution for 13-20=9R equation:


Simplifying
13 + -20 = 9R

Combine like terms: 13 + -20 = -7
-7 = 9R

Solving
-7 = 9R

Solving for variable 'R'.

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

Add '-9R' to each side of the equation.
-7 + -9R = 9R + -9R

Combine like terms: 9R + -9R = 0
-7 + -9R = 0

Add '7' to each side of the equation.
-7 + 7 + -9R = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -9R = 0 + 7
-9R = 0 + 7

Combine like terms: 0 + 7 = 7
-9R = 7

Divide each side by '-9'.
R = -0.7777777778

Simplifying
R = -0.7777777778

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