r-7.1=-8

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Solution for r-7.1=-8 equation: 


Simplifying
r + -7.1 = -8

Reorder the terms:
-7.1 + r = -8

Solving
-7.1 + r = -8

Solving for variable 'r'.

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

Add '7.1' to each side of the equation.
-7.1 + 7.1 + r = -8 + 7.1

Combine like terms: -7.1 + 7.1 = 0.0
0.0 + r = -8 + 7.1
r = -8 + 7.1

Combine like terms: -8 + 7.1 = -0.9
r = -0.9

Simplifying
r = -0.9

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