7-9r-(r+12)=25

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Solution for 7-9r-(r+12)=25 equation:


Simplifying
7 + -9r + -1(r + 12) = 25

Reorder the terms:
7 + -9r + -1(12 + r) = 25
7 + -9r + (12 * -1 + r * -1) = 25
7 + -9r + (-12 + -1r) = 25

Reorder the terms:
7 + -12 + -9r + -1r = 25

Combine like terms: 7 + -12 = -5
-5 + -9r + -1r = 25

Combine like terms: -9r + -1r = -10r
-5 + -10r = 25

Solving
-5 + -10r = 25

Solving for variable 'r'.

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

Add '5' to each side of the equation.
-5 + 5 + -10r = 25 + 5

Combine like terms: -5 + 5 = 0
0 + -10r = 25 + 5
-10r = 25 + 5

Combine like terms: 25 + 5 = 30
-10r = 30

Divide each side by '-10'.
r = -3

Simplifying
r = -3

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