log по осн 0,5 (1-3x)=-2
1-3x=(1/2)^-2
1-3x=4
-3x=3
x=-1
log 0,5(1-3х)=-2
log0.5(1-3x)=log.0.50.5-2
log0.5(1-3x)=log0.54
3x=-3
X=-1
