-5r+21=4r-15

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Solution for -5r+21=4r-15 equation:


Simplifying
-5r + 21 = 4r + -15

Reorder the terms:
21 + -5r = 4r + -15

Reorder the terms:
21 + -5r = -15 + 4r

Solving
21 + -5r = -15 + 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.
21 + -5r + -4r = -15 + 4r + -4r

Combine like terms: -5r + -4r = -9r
21 + -9r = -15 + 4r + -4r

Combine like terms: 4r + -4r = 0
21 + -9r = -15 + 0
21 + -9r = -15

Add '-21' to each side of the equation.
21 + -21 + -9r = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -9r = -15 + -21
-9r = -15 + -21

Combine like terms: -15 + -21 = -36
-9r = -36

Divide each side by '-9'.
r = 4

Simplifying
r = 4

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