r-16=4

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Solution for r-16=4 equation: 


Simplifying
r + -16 = 4

Reorder the terms:
-16 + r = 4

Solving
-16 + r = 4

Solving for variable 'r'.

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

Add '16' to each side of the equation.
-16 + 16 + r = 4 + 16

Combine like terms: -16 + 16 = 0
0 + r = 4 + 16
r = 4 + 16

Combine like terms: 4 + 16 = 20
r = 20

Simplifying
r = 20

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