5х + 2х² - (2х² -10)= 25
5х + 2х² - 2х² + 10= 25
5х+ 10= 25
5х= 25-10
5х= 15
х= 3.
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5х + 2х² - (2х² -10)= 25
5х + 2х² - 2х² + 10= 25
5х+ 10= 25
5х= 25-10
5х= 15
х= 3.