r-20=40

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Solution for r-20=40 equation: 


Simplifying
r + -20 = 40

Reorder the terms:
-20 + r = 40

Solving
-20 + r = 40

Solving for variable 'r'.

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

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

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

Combine like terms: 40 + 20 = 60
r = 60

Simplifying
r = 60

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