6+r=-9

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Solution for 6+r=-9 equation: 


Simplifying
6 + r = -9

Solving
6 + r = -9

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + r = -9 + -6

Combine like terms: 6 + -6 = 0
0 + r = -9 + -6
r = -9 + -6

Combine like terms: -9 + -6 = -15
r = -15

Simplifying
r = -15

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