7+(-r)=-15

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Solution for 7+(-r)=-15 equation: 


Simplifying
7 + (-1r) = -15

Solving
7 + (-1r) = -15

Solving for variable 'r'.

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

Add '-7' to each side of the equation.
7 + -7 + (-1r) = -15 + -7

Combine like terms: 7 + -7 = 0
0 + (-1r) = -15 + -7
(-1r) = -15 + -7

Combine like terms: -15 + -7 = -22
(-1r) = -22

Divide each side by '-1'.
r = 22

Simplifying
r = 22

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