t = -П/4 +2Пk
t = -3П/4 + 2Пk
2.а 10-7х=х+26
10-26-7х-х=0
-16-8х=0
-8х=16
х=16/-8
х=-2
2-3*(2x+5)=(3x-15)-6
2-6х-15=3х-21
-6х-3х=-21-2+16
-9х=-7
х=7/9