(9r+9)-(r-2)=

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Solution for (9r+9)-(r-2)= equation:


Simplifying
(9r + 9) + -1(r + -2) = 0

Reorder the terms:
(9 + 9r) + -1(r + -2) = 0

Remove parenthesis around (9 + 9r)
9 + 9r + -1(r + -2) = 0

Reorder the terms:
9 + 9r + -1(-2 + r) = 0
9 + 9r + (-2 * -1 + r * -1) = 0
9 + 9r + (2 + -1r) = 0

Reorder the terms:
9 + 2 + 9r + -1r = 0

Combine like terms: 9 + 2 = 11
11 + 9r + -1r = 0

Combine like terms: 9r + -1r = 8r
11 + 8r = 0

Solving
11 + 8r = 0

Solving for variable 'r'.

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

Add '-11' to each side of the equation.
11 + -11 + 8r = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 8r = 0 + -11
8r = 0 + -11

Combine like terms: 0 + -11 = -11
8r = -11

Divide each side by '8'.
r = -1.375

Simplifying
r = -1.375

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