помогите пжж...............

x=0.5
12 (x+3)-5x-21=12x+36-5x-21=7x+15=7×0.5+15=18.5

y=1.6
-3(8.2y-7)+4.6y= -24.6y+21+4.6y= -20y+21= -20×1.6+21=-11

x= -1
0.9 (4x+3)-(1.6x-0.3)=3.6x+2.7-1.6x+0.3=2x+3= 2×(-1)+3=1

x=-3
7 (x+5)-2 (x-3)=7x+35-2x+6=5x+41=5×(-3)+41=-26