45-r=20

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Solution for 45-r=20 equation: 


Simplifying
45 + -1r = 20

Solving
45 + -1r = 20

Solving for variable 'r'.

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

Add '-45' to each side of the equation.
45 + -45 + -1r = 20 + -45

Combine like terms: 45 + -45 = 0
0 + -1r = 20 + -45
-1r = 20 + -45

Combine like terms: 20 + -45 = -25
-1r = -25

Divide each side by '-1'.
r = 25

Simplifying
r = 25

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