{–4}
Пошаговое объяснение:
(5х–1)(х+2)+3(х–4)(х+4)=2(2х+3)²–8
5х²–х+10х–2+3(х²–16)=2(4х²+12х+9)–8
5х²–х+10х–2+3х²–48=8х²+24х+18–8
8х²+9х–50=8х²+24х+10
8х²+9х–8х²–24х=10+50
–15х=60
х= 60:(–15) = –4
