-r=15+4r

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Solution for -r=15+4r equation: 


Simplifying
-1r = 15 + 4r

Solving
-1r = 15 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-1r + -4r = 15 + 4r + -4r

Combine like terms: -1r + -4r = -5r
-5r = 15 + 4r + -4r

Combine like terms: 4r + -4r = 0
-5r = 15 + 0
-5r = 15

Divide each side by '-5'.
r = -3

Simplifying
r = -3

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