20+9r=15r-8r-6

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Solution for 20+9r=15r-8r-6 equation:


Simplifying
20 + 9r = 15r + -8r + -6

Reorder the terms:
20 + 9r = -6 + 15r + -8r

Combine like terms: 15r + -8r = 7r
20 + 9r = -6 + 7r

Solving
20 + 9r = -6 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
20 + 9r + -7r = -6 + 7r + -7r

Combine like terms: 9r + -7r = 2r
20 + 2r = -6 + 7r + -7r

Combine like terms: 7r + -7r = 0
20 + 2r = -6 + 0
20 + 2r = -6

Add '-20' to each side of the equation.
20 + -20 + 2r = -6 + -20

Combine like terms: 20 + -20 = 0
0 + 2r = -6 + -20
2r = -6 + -20

Combine like terms: -6 + -20 = -26
2r = -26

Divide each side by '2'.
r = -13

Simplifying
r = -13

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