9+9r-1=9r+20-2r

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Solution for 9+9r-1=9r+20-2r equation:


Simplifying
9 + 9r + -1 = 9r + 20 + -2r

Reorder the terms:
9 + -1 + 9r = 9r + 20 + -2r

Combine like terms: 9 + -1 = 8
8 + 9r = 9r + 20 + -2r

Reorder the terms:
8 + 9r = 20 + 9r + -2r

Combine like terms: 9r + -2r = 7r
8 + 9r = 20 + 7r

Solving
8 + 9r = 20 + 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.
8 + 9r + -7r = 20 + 7r + -7r

Combine like terms: 9r + -7r = 2r
8 + 2r = 20 + 7r + -7r

Combine like terms: 7r + -7r = 0
8 + 2r = 20 + 0
8 + 2r = 20

Add '-8' to each side of the equation.
8 + -8 + 2r = 20 + -8

Combine like terms: 8 + -8 = 0
0 + 2r = 20 + -8
2r = 20 + -8

Combine like terms: 20 + -8 = 12
2r = 12

Divide each side by '2'.
r = 6

Simplifying
r = 6

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