(-7×2-4)+(-7×2-6x-2)

Remove parentheses.

-7×2-4-7×2-6x-2

Subtract 7×2 from -7×2.

-14×2-4-6x-2

Subtract 2 from -4.

-14×2-6x-6

Add (-7x^2-4)+(-7x^2-6x-2)

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# Add (-7x^2-4)+(-7x^2-6x-2)

(-7×2-4)+(-7×2-6x-2)

Remove parentheses.

-7×2-4-7×2-6x-2

Subtract 7×2 from -7×2.

-14×2-4-6x-2

Subtract 2 from -4.

-14×2-6x-6

Add (-7x^2-4)+(-7x^2-6x-2)