4r+9r=78

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Solution for 4r+9r=78 equation: 


Simplifying
4r + 9r = 78

Combine like terms: 4r + 9r = 13r
13r = 78

Solving
13r = 78

Solving for variable 'r'.

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

Divide each side by '13'.
r = 6

Simplifying
r = 6

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