Question

3a(a+5)-2a(a-3)-7(9-a)
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Answer 1

$\huge\bold\red{Hey!}$

$3a(a + 5) - 2a(a - 3)-7(9-a) \\ {3a}^{2} + 15a - {2a}^{2} + 6a - 63 + 7a \\ {a}^{2} - 63 + 28a$