r+.12=.2

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Solution for r+.12=.2 equation: 


Simplifying
r + 0.12 = 0.2

Reorder the terms:
0.12 + r = 0.2

Solving
0.12 + r = 0.2

Solving for variable 'r'.

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

Add '-0.12' to each side of the equation.
0.12 + -0.12 + r = 0.2 + -0.12

Combine like terms: 0.12 + -0.12 = 0.00
0.00 + r = 0.2 + -0.12
r = 0.2 + -0.12

Combine like terms: 0.2 + -0.12 = 0.08
r = 0.08

Simplifying
r = 0.08

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