3r+r+3r-9r=19

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Solution for 3r+r+3r-9r=19 equation: 


Simplifying
3r + r + 3r + -9r = 19

Combine like terms: 3r + r = 4r
4r + 3r + -9r = 19

Combine like terms: 4r + 3r = 7r
7r + -9r = 19

Combine like terms: 7r + -9r = -2r
-2r = 19

Solving
-2r = 19

Solving for variable 'r'.

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

Divide each side by '-2'.
r = -9.5

Simplifying
r = -9.5

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