9r+1-7r+1=-15

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Solution for 9r+1-7r+1=-15 equation:


Simplifying
9r + 1 + -7r + 1 = -15

Reorder the terms:
1 + 1 + 9r + -7r = -15

Combine like terms: 1 + 1 = 2
2 + 9r + -7r = -15

Combine like terms: 9r + -7r = 2r
2 + 2r = -15

Solving
2 + 2r = -15

Solving for variable 'r'.

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

Add '-2' to each side of the equation.
2 + -2 + 2r = -15 + -2

Combine like terms: 2 + -2 = 0
0 + 2r = -15 + -2
2r = -15 + -2

Combine like terms: -15 + -2 = -17
2r = -17

Divide each side by '2'.
r = -8.5

Simplifying
r = -8.5

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