6r+21=2r-9

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Solution for 6r+21=2r-9 equation:


Simplifying
6r + 21 = 2r + -9

Reorder the terms:
21 + 6r = 2r + -9

Reorder the terms:
21 + 6r = -9 + 2r

Solving
21 + 6r = -9 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
21 + 6r + -2r = -9 + 2r + -2r

Combine like terms: 6r + -2r = 4r
21 + 4r = -9 + 2r + -2r

Combine like terms: 2r + -2r = 0
21 + 4r = -9 + 0
21 + 4r = -9

Add '-21' to each side of the equation.
21 + -21 + 4r = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 4r = -9 + -21
4r = -9 + -21

Combine like terms: -9 + -21 = -30
4r = -30

Divide each side by '4'.
r = -7.5

Simplifying
r = -7.5

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