f(x)=lx-1l+lx-2l+lx-3l

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Solution for f(x)=lx-1l+lx-2l+lx-3l equation: 


Simplifying
f(x) = lx + -1l + lx + -2l + lx + -3l

Multiply f * x
fx = lx + -1l + lx + -2l + lx + -3l

Reorder the terms:
fx = -1l + -2l + -3l + lx + lx + lx

Combine like terms: -1l + -2l = -3l
fx = -3l + -3l + lx + lx + lx

Combine like terms: -3l + -3l = -6l
fx = -6l + lx + lx + lx

Combine like terms: lx + lx = 2lx
fx = -6l + 2lx + lx

Combine like terms: 2lx + lx = 3lx
fx = -6l + 3lx

Solving
fx = -6l + 3lx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -6lx-1 + 3l

Simplifying
f = -6lx-1 + 3l

Reorder the terms:
f = 3l + -6lx-1

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