Решите уравнение
10)5х^2+5х-15=2х^+11х+9
11)3х^2-10х+30=7х^2+2х+3
12)4х^2+3х-12=3х^2-6х-14
13)-3х^2-х+8=(х-3)^2
14)(х-1)^2=2х^2-6х-31
15)(х-7)^2=2х^2+11х+23
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