8+2r-5=9r+21-5r

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Solution for 8+2r-5=9r+21-5r equation:


Simplifying
8 + 2r + -5 = 9r + 21 + -5r

Reorder the terms:
8 + -5 + 2r = 9r + 21 + -5r

Combine like terms: 8 + -5 = 3
3 + 2r = 9r + 21 + -5r

Reorder the terms:
3 + 2r = 21 + 9r + -5r

Combine like terms: 9r + -5r = 4r
3 + 2r = 21 + 4r

Solving
3 + 2r = 21 + 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.
3 + 2r + -4r = 21 + 4r + -4r

Combine like terms: 2r + -4r = -2r
3 + -2r = 21 + 4r + -4r

Combine like terms: 4r + -4r = 0
3 + -2r = 21 + 0
3 + -2r = 21

Add '-3' to each side of the equation.
3 + -3 + -2r = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -2r = 21 + -3
-2r = 21 + -3

Combine like terms: 21 + -3 = 18
-2r = 18

Divide each side by '-2'.
r = -9

Simplifying
r = -9

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