60=300-12r

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Solution for 60=300-12r equation:


Simplifying
60 = 300 + -12r

Solving
60 = 300 + -12r

Solving for variable 'r'.

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

Add '12r' to each side of the equation.
60 + 12r = 300 + -12r + 12r

Combine like terms: -12r + 12r = 0
60 + 12r = 300 + 0
60 + 12r = 300

Add '-60' to each side of the equation.
60 + -60 + 12r = 300 + -60

Combine like terms: 60 + -60 = 0
0 + 12r = 300 + -60
12r = 300 + -60

Combine like terms: 300 + -60 = 240
12r = 240

Divide each side by '12'.
r = 20

Simplifying
r = 20

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