Ответ:\(19p-19p-y+23y=(-y+23y)=22y\).\((-16c+3c)+(-21n+13n)=-13c-8n\).\((1.2s-1.3s)+(2.2t-1.7t)=-0.1s+0.5t\).\((9-9)+16+u+u=2u+16\).\((-z+2z)+(28x-28x)+28=z+28\).\((1.6+1.2-1.7)-v-(1.2f+0.7f)=1.1-v-1.9f\).