9r+8=13

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Solution for 9r+8=13 equation: 


Simplifying
9r + 8 = 13

Reorder the terms:
8 + 9r = 13

Solving
8 + 9r = 13

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + 9r = 13 + -8

Combine like terms: 8 + -8 = 0
0 + 9r = 13 + -8
9r = 13 + -8

Combine like terms: 13 + -8 = 5
9r = 5

Divide each side by '9'.
r = 0.5555555556

Simplifying
r = 0.5555555556

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