r-(-1)=9

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Solution for r-(-1)=9 equation: 


Simplifying
r + -1(-1) = 9

Multiply -1 * -1
r + 1 = 9

Reorder the terms:
1 + r = 9

Solving
1 + r = 9

Solving for variable 'r'.

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

Add '-1' to each side of the equation.
1 + -1 + r = 9 + -1

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

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

Simplifying
r = 8

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