(10r+9)-(12r-5)=

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Solution for (10r+9)-(12r-5)= equation:


Simplifying
(10r + 9) + -1(12r + -5) = 0

Reorder the terms:
(9 + 10r) + -1(12r + -5) = 0

Remove parenthesis around (9 + 10r)
9 + 10r + -1(12r + -5) = 0

Reorder the terms:
9 + 10r + -1(-5 + 12r) = 0
9 + 10r + (-5 * -1 + 12r * -1) = 0
9 + 10r + (5 + -12r) = 0

Reorder the terms:
9 + 5 + 10r + -12r = 0

Combine like terms: 9 + 5 = 14
14 + 10r + -12r = 0

Combine like terms: 10r + -12r = -2r
14 + -2r = 0

Solving
14 + -2r = 0

Solving for variable 'r'.

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

Add '-14' to each side of the equation.
14 + -14 + -2r = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -2r = 0 + -14
-2r = 0 + -14

Combine like terms: 0 + -14 = -14
-2r = -14

Divide each side by '-2'.
r = 7

Simplifying
r = 7

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