-3r+5=5r+21

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Solution for -3r+5=5r+21 equation:


Simplifying
-3r + 5 = 5r + 21

Reorder the terms:
5 + -3r = 5r + 21

Reorder the terms:
5 + -3r = 21 + 5r

Solving
5 + -3r = 21 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
5 + -3r + -5r = 21 + 5r + -5r

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

Combine like terms: 5r + -5r = 0
5 + -8r = 21 + 0
5 + -8r = 21

Add '-5' to each side of the equation.
5 + -5 + -8r = 21 + -5

Combine like terms: 5 + -5 = 0
0 + -8r = 21 + -5
-8r = 21 + -5

Combine like terms: 21 + -5 = 16
-8r = 16

Divide each side by '-8'.
r = -2

Simplifying
r = -2

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