f(3)=-0.3(3+5)3-2

Solution for f(3)=-0.3(3+5)3-2 equation:

Simplifying
f(3) = -0.3(3 + 5) * 3 + -2

Reorder the terms for easier multiplication:
3f = -0.3(3 + 5) * 3 + -2

Combine like terms: 3 + 5 = 8
3f = -0.3(8) * 3 + -2

Multiply -0.3 * 8
3f = -2.4 * 3 + -2

Multiply -2.4 * 3
3f = -7.2 + -2

Combine like terms: -7.2 + -2 = -9.2
3f = -9.2

Solving
3f = -9.2

Solving for variable 'f'.

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

Divide each side by '3'.
f = -3.066666667

Simplifying
f = -3.066666667