4r-6-8x-9=21

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


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

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

Combine like terms: -6 + -9 = -15
-15 + 4r + -8x = 21

Solving
-15 + 4r + -8x = 21

Solving for variable 'r'.

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

Add '15' to each side of the equation.
-15 + 4r + 15 + -8x = 21 + 15

Reorder the terms:
-15 + 15 + 4r + -8x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4r + -8x = 21 + 15
4r + -8x = 21 + 15

Combine like terms: 21 + 15 = 36
4r + -8x = 36

Add '8x' to each side of the equation.
4r + -8x + 8x = 36 + 8x

Combine like terms: -8x + 8x = 0
4r + 0 = 36 + 8x
4r = 36 + 8x

Divide each side by '4'.
r = 9 + 2x

Simplifying
r = 9 + 2x

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