I need help with this

7x2 −5x 2 −40x−30
(7x 3−5x+42x−30)+(7x−5)
Add the terms
7x 3+37x−30+(7x−5)
Subtract the terms
7x 3+37x−30+7x−5
Collect like terms
7x 3 +44x−30−5
Solution
7x 3+44x−35
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