7r+9r=20

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Solution for 7r+9r=20 equation: 


Simplifying
7r + 9r = 20

Combine like terms: 7r + 9r = 16r
16r = 20

Solving
16r = 20

Solving for variable 'r'.

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

Divide each side by '16'.
r = 1.25

Simplifying
r = 1.25

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