r-25=-40

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Solution for r-25=-40 equation: 


Simplifying
r + -25 = -40

Reorder the terms:
-25 + r = -40

Solving
-25 + r = -40

Solving for variable 'r'.

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

Add '25' to each side of the equation.
-25 + 25 + r = -40 + 25

Combine like terms: -25 + 25 = 0
0 + r = -40 + 25
r = -40 + 25

Combine like terms: -40 + 25 = -15
r = -15

Simplifying
r = -15

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