f+3r=12r

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Solution for f+3r=12r equation: 


Simplifying
f + 3r = 12r

Solving
f + 3r = 12r

Solving for variable 'f'.

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

Add '-3r' to each side of the equation.
f + 3r + -3r = 12r + -3r

Combine like terms: 3r + -3r = 0
f + 0 = 12r + -3r
f = 12r + -3r

Combine like terms: 12r + -3r = 9r
f = 9r

Simplifying
f = 9r

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