у = 8 - 2х
3х + 4 (8 - 2х) - 7 = 0
3х + 32 - 8х - 7 = 0
5х = 25
х = 5
у = 8 -2*5 = 8 - 10 = -2
х*у = -2 * 5 = -10
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