f(x)=9-4(-1+1)

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Solution for f(x)=9-4(-1+1) equation: 


Simplifying
f(x) = 9 + -4(-1 + 1)

Multiply f * x
fx = 9 + -4(-1 + 1)

Combine like terms: -1 + 1 = 0
fx = 9 + -4(0)

Multiply -4 * 0
fx = 9 + 0

Anything times zero is zero.
fx = 9 + 0

Combine like terms: 9 + 0 = 9
fx = 9

Solving
fx = 9

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 9x-1

Simplifying
f = 9x-1

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