0,2(7-2р)=2,3 - 0,3(р-6)
0.2(7-2p)=2.3-0.3(p-6) 1.4-0.4p=2.3-0.3p+1.8 -0.4p+0.3p=2.3+1.8-1.4 -0.1p=2.7 p=2.7:(-0.1) p=-27