21r-20+12r=4r-28

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Solution for 21r-20+12r=4r-28 equation:


Simplifying
21r + -20 + 12r = 4r + -28

Reorder the terms:
-20 + 21r + 12r = 4r + -28

Combine like terms: 21r + 12r = 33r
-20 + 33r = 4r + -28

Reorder the terms:
-20 + 33r = -28 + 4r

Solving
-20 + 33r = -28 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-20 + 33r + -4r = -28 + 4r + -4r

Combine like terms: 33r + -4r = 29r
-20 + 29r = -28 + 4r + -4r

Combine like terms: 4r + -4r = 0
-20 + 29r = -28 + 0
-20 + 29r = -28

Add '20' to each side of the equation.
-20 + 20 + 29r = -28 + 20

Combine like terms: -20 + 20 = 0
0 + 29r = -28 + 20
29r = -28 + 20

Combine like terms: -28 + 20 = -8
29r = -8

Divide each side by '29'.
r = -0.275862069

Simplifying
r = -0.275862069

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