Ответ:
-2х² - 2х² + 7х - 7 = -2х²- 6х + 5х - 15 + 3х - 80
2
-2х² - 2х + 7х + 2х² + 6х - 5х - 3х = -15 - 80 + 7
3х = -87
х = -87 : 3
х = -29
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Ответ:
-2х² - 2х² + 7х - 7 = -2х²- 6х + 5х - 15 + 3х - 80
2
-2х² - 2х + 7х + 2х² + 6х - 5х - 3х = -15 - 80 + 7
3х = -87
х = -87 : 3
х = -29