15r-18r=687

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Solution for 15r-18r=687 equation: 


Simplifying
15r + -18r = 687

Combine like terms: 15r + -18r = -3r
-3r = 687

Solving
-3r = 687

Solving for variable 'r'.

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

Divide each side by '-3'.
r = -229

Simplifying
r = -229

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