9-r=21r-19

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Solution for 9-r=21r-19 equation:


Simplifying
9 + -1r = 21r + -19

Reorder the terms:
9 + -1r = -19 + 21r

Solving
9 + -1r = -19 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
9 + -1r + -21r = -19 + 21r + -21r

Combine like terms: -1r + -21r = -22r
9 + -22r = -19 + 21r + -21r

Combine like terms: 21r + -21r = 0
9 + -22r = -19 + 0
9 + -22r = -19

Add '-9' to each side of the equation.
9 + -9 + -22r = -19 + -9

Combine like terms: 9 + -9 = 0
0 + -22r = -19 + -9
-22r = -19 + -9

Combine like terms: -19 + -9 = -28
-22r = -28

Divide each side by '-22'.
r = 1.272727273

Simplifying
r = 1.272727273

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