log (3-x) по основанию1/2 = -2

log1/2;(3-x)=-2

log1/2;(3-x)=-2*log1/2;1/2

log1/2;(3-x)=log1/2;(1/2)^(-2)

log1/2;(3-x)=log1/2;2^2

log1/2;(3-x)=log1/2;4

3-x=4

x=-1