4-2х=-4х+5
-2х+4х=5-4
2х=1
х=1/2
5х-2(7+5х)=-4х-10
5х-14-10х=-4х-10
-5х+4х=14-10
-х=4
х=-4
3х²+13х-10=0
D=169+120=289
x1=2/3
x2=-5
4-2х=-4х+5
-2х+4х=5-4
2х=1
х=1/2
5х-2(7+5х)=-4х-10
5х-14-10х=-4х-10
-5х+4х=14-10
-х=4
х=-4
3х²+13х-10=0
D=169+120=289
x1=2/3
x2=-5