f(x)=9(0.7+0.2)x

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Solution for f(x)=9(0.7+0.2)x equation: 


Simplifying
f(x) = 9(0.7 + 0.2) * x

Multiply f * x
fx = 9(0.7 + 0.2) * x

Combine like terms: 0.7 + 0.2 = 0.9
fx = 9(0.9) * x

Multiply 9 * 0.9
fx = 8.1x

Solving
fx = 8.1x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 8.1

Simplifying
f = 8.1

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