r+10=9

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Solution for r+10=9 equation: 


Simplifying
r + 10 = 9

Reorder the terms:
10 + r = 9

Solving
10 + r = 9

Solving for variable 'r'.

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

Add '-10' to each side of the equation.
10 + -10 + r = 9 + -10

Combine like terms: 10 + -10 = 0
0 + r = 9 + -10
r = 9 + -10

Combine like terms: 9 + -10 = -1
r = -1

Simplifying
r = -1

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