Remove parentheses.

Add and .

Subtract from .

Add and .

Simplify 4x^2+12x-9+(7x^2-x+3)

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# Simplify 4x^2+12x-9+(7x^2-x+3)

Remove parentheses.

Add and .

Subtract from .

Add and .

Simplify 4x^2+12x-9+(7x^2-x+3)