9-r=-3r-r

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Solution for 9-r=-3r-r equation:


Simplifying
9 + -1r = -3r + -1r

Combine like terms: -3r + -1r = -4r
9 + -1r = -4r

Solving
9 + -1r = -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.
9 + -1r + 4r = -4r + 4r

Combine like terms: -1r + 4r = 3r
9 + 3r = -4r + 4r

Combine like terms: -4r + 4r = 0
9 + 3r = 0

Add '-9' to each side of the equation.
9 + -9 + 3r = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 3r = 0 + -9
3r = 0 + -9

Combine like terms: 0 + -9 = -9
3r = -9

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

Simplifying
r = -3

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