5r-4s=-9

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Solution for 5r-4s=-9 equation: 


Simplifying
5r + -4s = -9

Solving
5r + -4s = -9

Solving for variable 'r'.

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

Add '4s' to each side of the equation.
5r + -4s + 4s = -9 + 4s

Combine like terms: -4s + 4s = 0
5r + 0 = -9 + 4s
5r = -9 + 4s

Divide each side by '5'.
r = -1.8 + 0.8s

Simplifying
r = -1.8 + 0.8s

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