2r-40=-280

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Solution for 2r-40=-280 equation: 


Simplifying
2r + -40 = -280

Reorder the terms:
-40 + 2r = -280

Solving
-40 + 2r = -280

Solving for variable 'r'.

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

Add '40' to each side of the equation.
-40 + 40 + 2r = -280 + 40

Combine like terms: -40 + 40 = 0
0 + 2r = -280 + 40
2r = -280 + 40

Combine like terms: -280 + 40 = -240
2r = -240

Divide each side by '2'.
r = -120

Simplifying
r = -120

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