39=54-5r

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Solution for 39=54-5r equation:


Simplifying
39 = 54 + -5r

Solving
39 = 54 + -5r

Solving for variable 'r'.

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

Add '5r' to each side of the equation.
39 + 5r = 54 + -5r + 5r

Combine like terms: -5r + 5r = 0
39 + 5r = 54 + 0
39 + 5r = 54

Add '-39' to each side of the equation.
39 + -39 + 5r = 54 + -39

Combine like terms: 39 + -39 = 0
0 + 5r = 54 + -39
5r = 54 + -39

Combine like terms: 54 + -39 = 15
5r = 15

Divide each side by '5'.
r = 3

Simplifying
r = 3

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