r+20=10.2

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Solution for r+20=10.2 equation: 


Simplifying
r + 20 = 10.2

Reorder the terms:
20 + r = 10.2

Solving
20 + r = 10.2

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 = 10.2 + -20

Combine like terms: 20 + -20 = 0
0 + r = 10.2 + -20
r = 10.2 + -20

Combine like terms: 10.2 + -20 = -9.8
r = -9.8

Simplifying
r = -9.8

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