1) (8х + 10)(3 - х) = (11 - 2х)(4х + 5) - 5
24х + 30 - 8х² - 10х = 44х - 8х² + 55 - 10х - 5
8х² - 8х² + 24х - 10х - 44х + 10х = 55 - 5 - 30
-20х = 20
х = 20 : (-20)
х = -1
2) 14х² - (2х - 3)(7х + 4) = 14
14х² - (14х² - 21х + 8х - 12) = 14
14х² - 14х² + 21х - 8х + 12 = 14
13х = 14 - 12
13х = 2
х = 2/13
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Verified answer
1) (8х + 10)(3 - х) = (11 - 2х)(4х + 5) - 5
24х + 30 - 8х² - 10х = 44х - 8х² + 55 - 10х - 5
8х² - 8х² + 24х - 10х - 44х + 10х = 55 - 5 - 30
-20х = 20
х = 20 : (-20)
х = -1
2) 14х² - (2х - 3)(7х + 4) = 14
14х² - (14х² - 21х + 8х - 12) = 14
14х² - 14х² + 21х - 8х + 12 = 14
13х = 14 - 12
13х = 2
х = 2/13