-56xy: it means -1 times 8 times x times 7 times y
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No.
The given expressions can be simplified to: 7y-8x-14
Without an inequality sign it is not an inequality equation but the given expression can be simplified to: 8x-16-7y
8x - 7y = 7 (A)7x + 8y = 8 (B)7*(A): 56x - 49y = 498*(B): 56x + 64y = 648*(B)-7*(A): (64+49)*y = 64-49=> 113y = 15=> y = 15/113
2x times 4x is 8x squared- then that times x is 8x to the power of three.Mathmatically represented as 8x^3