Algebraic manipulation

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Hi,

How can I manipulate a algebraic expression trying to extract a used defined term.

Exemple:

(4x-12) --> I know I can factor this term. Does exists any kind of control that I can specify a term?
I would like to specif "(x-3)" --> 4.(x-3)

Another Exemple:

(3-(4/5x)-(-5) --> I would like to specify a term "(x-10)" and see it´s possible.

Does the calculator can do that? Or any alternative?

Thanks