f(x)=x-3x+1

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Solution for f(x)=x-3x+1 equation: 


Simplifying
f(x) = x + -3x + 1

Multiply f * x
fx = x + -3x + 1

Reorder the terms:
fx = 1 + x + -3x

Combine like terms: x + -3x = -2x
fx = 1 + -2x

Solving
fx = 1 + -2x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = x-1 + -2

Simplifying
f = x-1 + -2

Reorder the terms:
f = -2 + x-1

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