3(2-f)=15

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Solution for 3(2-f)=15 equation: 


Simplifying
3(2 + -1f) = 15
(2 * 3 + -1f * 3) = 15
(6 + -3f) = 15

Solving
6 + -3f = 15

Solving for variable 'f'.

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

Add '-6' to each side of the equation.
6 + -6 + -3f = 15 + -6

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

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

Divide each side by '-3'.
f = -3

Simplifying
f = -3

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