решите неравенство:
5y+9<3-7y</p>
5у+7у < 3-9
12y < -6
y < -1/2
5y+9<3-7y</span>
5у+7у<3-9</span>
12у<-6</span>
у<-6/12</span>
у<-1/2</span>