5+-9(-9f+-8)=

Solution for 5+-9(-9f+-8)= equation:

Simplifying
5 + -9(-9f + -8) = 0

Reorder the terms:
5 + -9(-8 + -9f) = 0
5 + (-8 * -9 + -9f * -9) = 0
5 + (72 + 81f) = 0

Combine like terms: 5 + 72 = 77
77 + 81f = 0

Solving
77 + 81f = 0

Solving for variable 'f'.

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

Add '-77' to each side of the equation.
77 + -77 + 81f = 0 + -77

Combine like terms: 77 + -77 = 0
0 + 81f = 0 + -77
81f = 0 + -77

Combine like terms: 0 + -77 = -77
81f = -77

Divide each side by '81'.
f = -0.950617284

Simplifying
f = -0.950617284