3r+4r-9=-15

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Solution for 3r+4r-9=-15 equation:


Simplifying
3r + 4r + -9 = -15

Reorder the terms:
-9 + 3r + 4r = -15

Combine like terms: 3r + 4r = 7r
-9 + 7r = -15

Solving
-9 + 7r = -15

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 7r = -15 + 9

Combine like terms: -9 + 9 = 0
0 + 7r = -15 + 9
7r = -15 + 9

Combine like terms: -15 + 9 = -6
7r = -6

Divide each side by '7'.
r = -0.8571428571

Simplifying
r = -0.8571428571

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