-20=-40+r

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Solution for -20=-40+r equation:


Simplifying
-20 = -40 + r

Solving
-20 = -40 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-20 + -1r = -40 + r + -1r

Combine like terms: r + -1r = 0
-20 + -1r = -40 + 0
-20 + -1r = -40

Add '20' to each side of the equation.
-20 + 20 + -1r = -40 + 20

Combine like terms: -20 + 20 = 0
0 + -1r = -40 + 20
-1r = -40 + 20

Combine like terms: -40 + 20 = -20
-1r = -20

Divide each side by '-1'.
r = 20

Simplifying
r = 20

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