2r+5r=28

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Solution for 2r+5r=28 equation: 


Simplifying
2r + 5r = 28

Combine like terms: 2r + 5r = 7r
7r = 28

Solving
7r = 28

Solving for variable 'r'.

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

Divide each side by '7'.
r = 4

Simplifying
r = 4

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