-6r-(-r)-15r=20

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Solution for -6r-(-r)-15r=20 equation: 


Simplifying
-6r + -1(-1r) + -15r = 20

Remove parenthesis around (-1r)
-6r + -1 * -1r + -15r = 20

Multiply -1 * -1
-6r + 1r + -15r = 20

Combine like terms: -6r + 1r = -5r
-5r + -15r = 20

Combine like terms: -5r + -15r = -20r
-20r = 20

Solving
-20r = 20

Solving for variable 'r'.

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

Divide each side by '-20'.
r = -1

Simplifying
r = -1

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