4r-21=4+9r

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Solution for 4r-21=4+9r equation:


Simplifying
4r + -21 = 4 + 9r

Reorder the terms:
-21 + 4r = 4 + 9r

Solving
-21 + 4r = 4 + 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.
-21 + 4r + -9r = 4 + 9r + -9r

Combine like terms: 4r + -9r = -5r
-21 + -5r = 4 + 9r + -9r

Combine like terms: 9r + -9r = 0
-21 + -5r = 4 + 0
-21 + -5r = 4

Add '21' to each side of the equation.
-21 + 21 + -5r = 4 + 21

Combine like terms: -21 + 21 = 0
0 + -5r = 4 + 21
-5r = 4 + 21

Combine like terms: 4 + 21 = 25
-5r = 25

Divide each side by '-5'.
r = -5

Simplifying
r = -5

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