1) 0,3x+8=2 0.3x=2-8 0.3x=-6 x=-6/0.3 x = -20
2) 4-x=1+4x -x-4x=1-4 -5x=-3 x=-3/(-5) x = 0.6
3) 7-2(x+3)=9-6x -2x+6x=9-7+6 4x=8 x=8/4 x = 2
4) 4(x-0.5)-2(x+0.3)=-2.6 4x-2x = -2.6+2+0.6 2x = 0 x=0/2 x = 0
5) 0.4x-6= -12 0.4x = -12+6 0.4x = -6 x = -6/0.4 x = -15
6) x+6=5+4x x-4x=5-6 -3x = -1 x = -1/(-3) x = 1/3
7) 13-3(x+1) = 4-5x -3x +5x = 4-13+3 2x = -6 x = -6/2 x = -3
8) 0.2(3x-5)-0.3(x-1) = -0.7 0.6x - 0.3x = -0.7+1-0.3 0.3x = 0 x = 0/0.3 x = 0
х-5 =0 и х +4 = 0
х=5 и х =-4
(1,3x-1,2)(4+8x)=0
1,3х-1,2 =0 4+8х =0
1,3х = 1,2 8х = -4
х = 1,2 /1,3 х = -4/8
х=12//13 х = -0,5
(12x+3)(-8x-2-4x+21)(-18x+0,2)=0
12х+3=0 -8х-2-4х+21 = 0 -18х+0,2 =0
12х = -3 -12х +19=0 -18х = -0,2
х = -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)=0
5х-7х-15-х+21 =0 -18х+0,2=0
-3х +6 =0 -18х = -0,2
-3х = -6 х = -0,2/-18
х = -6/-3 х = 2/180
х=2 х= 1/90
2-3y/7=-2y-1/3
-3у/7 +2у = -1/3 -2
(-3у + 14у)/7 = (-1 -6)/3
11у/7 = -7/3
11у *3 = 7*(-7)
33у = -49
у = - 49/33
2|x|-5/5=3|x|-4/8
(2/х/-5)*8 = (3/х/ -4)*5
16/х/ -40 = 15/х/ -20
16/х/ -15/х/ = -20 +40
/х/ = 20
х = 20 х=-20