6-r+4r=15

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Solution for 6-r+4r=15 equation: 


Simplifying
6 + -1r + 4r = 15

Combine like terms: -1r + 4r = 3r
6 + 3r = 15

Solving
6 + 3r = 15

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 + 3r = 15 + -6

Combine like terms: 6 + -6 = 0
0 + 3r = 15 + -6
3r = 15 + -6

Combine like terms: 15 + -6 = 9
3r = 9

Divide each side by '3'.
r = 3

Simplifying
r = 3

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