x/4 -4/x / 1 -4/x

Please try to bracket your terms to make it less ambiguous for us so we can actually decipher your problem. Is this your question: ?

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Hmm your algebra is a bit off:

(move to the left and -1 to the right)

(Simplify)

Keep going.

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For this question, you're going to have to factor as if you were with a trinomial:

Imagine :

Factor as you would with that. Then solve for theta.