1) 8x=-2
х=-2/8
х=-14
х=-0,25
2) -9x=15
х=-5/3
х=-1 2/3
х=-1,6
3) -7*х=-21
х=-21:-7
х=3
4) x:(-21)=7
-1/21х=7
х=-147
5) x*(-9)=45
-9х=45
х=-5
