If I understood you correctly you meant (78*57) - 89?
The answer will be 4,357.
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89 - 57 = 32
2x + 89 = 78 Therefore, 2x = 78 - 89 x = -11/2 x = -5.5
No, and 57 is not a prime number.
????????? ***** 57 × 78 = 4,446
89