3(4+f)=45

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Solution for 3(4+f)=45 equation: 


Simplifying
3(4 + f) = 45
(4 * 3 + f * 3) = 45
(12 + 3f) = 45

Solving
12 + 3f = 45

Solving for variable 'f'.

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

Add '-12' to each side of the equation.
12 + -12 + 3f = 45 + -12

Combine like terms: 12 + -12 = 0
0 + 3f = 45 + -12
3f = 45 + -12

Combine like terms: 45 + -12 = 33
3f = 33

Divide each side by '3'.
f = 11

Simplifying
f = 11

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