8r-21=-36+3r

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Solution for 8r-21=-36+3r equation:


Simplifying
8r + -21 = -36 + 3r

Reorder the terms:
-21 + 8r = -36 + 3r

Solving
-21 + 8r = -36 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
-21 + 8r + -3r = -36 + 3r + -3r

Combine like terms: 8r + -3r = 5r
-21 + 5r = -36 + 3r + -3r

Combine like terms: 3r + -3r = 0
-21 + 5r = -36 + 0
-21 + 5r = -36

Add '21' to each side of the equation.
-21 + 21 + 5r = -36 + 21

Combine like terms: -21 + 21 = 0
0 + 5r = -36 + 21
5r = -36 + 21

Combine like terms: -36 + 21 = -15
5r = -15

Divide each side by '5'.
r = -3

Simplifying
r = -3

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