(3у-4)*2=9у-24у+16
(3+5m)*2=9+30m+25m
(5a+6b)*2=25a*2+60ab+36b*2
(2y-3x)*2 =4y*2-12yx+9x*2
(a*2-3)*2=a*4-6a+9
(a*2-b*2)*2=a*4-2a*2b*2+b*4
1)у= 0.7, 1.22, 1.6 2)x= 0.25, 2.25, 6.25