15r-5r=70

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Solution for 15r-5r=70 equation: 


Simplifying
15r + -5r = 70

Combine like terms: 15r + -5r = 10r
10r = 70

Solving
10r = 70

Solving for variable 'r'.

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

Divide each side by '10'.
r = 7

Simplifying
r = 7

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