Robert is doing his quadratics factoring worksheet when a drop of ink ruins part of his work.

The problem asks him to factor $-35-x+12 x^2$ and he has correctly figured out one of two factors: $(3x + 5).$ What must be the other factor?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Robert is doing his quadratics factoring worksheet when a drop of ink ruins part of his work.

The problem asks him to factor $-35-x+12 x^2$ and he has correctly figured out one of two factors: $(3x + 5).$ What must be the other factor?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
(4x - 7)
Robert is doing his quadratics factoring worksheet when a drop of ink ruins part of his work.

The problem asks him to factor $-35-x+12 x^2$ and he has correctly figured out one of two factors: $(3x + 5).$ What must be the other factor?
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