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Question
Simplify:
`12"x"^2-(7"x"-overline(3"x"^2+15))`
Solution
`12"x"^2-(7"x"-overline(3"x"^2+15))`
= 12x2 − (7x − 3x2 − 15)
= 12x2 − 7x + 3x2 + 15
= 12x2 + 3x2 − 7x + 15
= 15x2 − 7x + 15
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