6r+9-4r+8=21

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Solution for 6r+9-4r+8=21 equation: 


Simplifying
6r + 9 + -4r + 8 = 21

Reorder the terms:
9 + 8 + 6r + -4r = 21

Combine like terms: 9 + 8 = 17
17 + 6r + -4r = 21

Combine like terms: 6r + -4r = 2r
17 + 2r = 21

Solving
17 + 2r = 21

Solving for variable 'r'.

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

Add '-17' to each side of the equation.
17 + -17 + 2r = 21 + -17

Combine like terms: 17 + -17 = 0
0 + 2r = 21 + -17
2r = 21 + -17

Combine like terms: 21 + -17 = 4
2r = 4

Divide each side by '2'.
r = 2

Simplifying
r = 2

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