r-8.5=-2.2

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Solution for r-8.5=-2.2 equation: 


Simplifying
r + -8.5 = -2.2

Reorder the terms:
-8.5 + r = -2.2

Solving
-8.5 + r = -2.2

Solving for variable 'r'.

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

Add '8.5' to each side of the equation.
-8.5 + 8.5 + r = -2.2 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + r = -2.2 + 8.5
r = -2.2 + 8.5

Combine like terms: -2.2 + 8.5 = 6.3
r = 6.3

Simplifying
r = 6.3

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