y=ln(x^2+k)+ln(x^2+9-k)

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Solution for y=ln(x^2+k)+ln(x^2+9-k) equation: 


Simplifying
y = ln(x2 + k) + ln(x2 + 9 + -1k)

Reorder the terms:
y = ln(k + x2) + ln(x2 + 9 + -1k)
y = (k * ln + x2 * ln) + ln(x2 + 9 + -1k)
y = (kln + lnx2) + ln(x2 + 9 + -1k)

Reorder the terms:
y = kln + lnx2 + ln(9 + -1k + x2)
y = kln + lnx2 + (9 * ln + -1k * ln + x2 * ln)

Reorder the terms:
y = kln + lnx2 + (-1kln + 9ln + lnx2)
y = kln + lnx2 + (-1kln + 9ln + lnx2)

Reorder the terms:
y = kln + -1kln + 9ln + lnx2 + lnx2

Combine like terms: kln + -1kln = 0
y = 0 + 9ln + lnx2 + lnx2
y = 9ln + lnx2 + lnx2

Combine like terms: lnx2 + lnx2 = 2lnx2
y = 9ln + 2lnx2

Solving
y = 9ln + 2lnx2

Solving for variable 'y'.

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

Simplifying
y = 9ln + 2lnx2

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