f(3)=(5(3)+2)(3-4)

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Solution for f(3)=(5(3)+2)(3-4) equation: 


Simplifying
f(3) = (5(3) + 2)(3 + -4)

Reorder the terms for easier multiplication:
3f = (5(3) + 2)(3 + -4)

Multiply 5 * 3
3f = (15 + 2)(3 + -4)

Combine like terms: 15 + 2 = 17
3f = (17)(3 + -4)

Combine like terms: 3 + -4 = -1
3f = 17(-1)

Multiply 17 * -1
3f = -17

Solving
3f = -17

Solving for variable 'f'.

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

Divide each side by '3'.
f = -5.666666667

Simplifying
f = -5.666666667

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