(x-5)(x+4)=0х-5 =0 и х +4 = 0х=5 и х =-4(1,3x-1,2)(4+8x)=01,3х-1,2 =0 4+8х =01,3х = 1,2 8х = -4х = 1,2 /1,3 х = -4/8х=12//13 х = -0,5(12x+3)(-8x-2-4x+21)(-18x+0,2)=012х+3=0 -8х-2-4х+21 = 0 -18х+0,2 =012х = -3 -12х +19=0 -18х = -0,2х = -3/12 -12х = -19 х = -0,2/-18 х = -1/4 х = 19/12 х = 0,1/9 х=1/90(5x-7x-15-x+21)(-18x+0,2)=05х-7х-15-х+21 =0 -18х+0,2=0-3х +6 =0 -18х = -0,2-3х = -6 х = -0,2/-18х = -6/-3 х = 2/180х=2 х= 1/902-3y/7=-2y-1/3-3у/7 +2у = -1/3 -2(-3у + 14у)/7 = (-1 -6)/311у/7 = -7/311у *3 = 7*(-7)33у = -49у = - 49/332|x|-5/5=3|x|-4/8(2/х/-5)*8 = (3/х/ -4)*516/х/ -40 = 15/х/ -2016/х/ -15/х/ = -20 +40/х/ = 20х = 20 х=-20