3x * 8 = -2 + 6x 24x = -2 + 6x 18x = -2 / : 18 x = -2/18 = -1/9 2 * 3x = 24 - 7x 6x = 24 - 7x 13x = 24 / : 13 x = 24/13 = 1 11/13 0,5x + 3 = -3x + 8 3,5x = 5 / : 3,5 x = 5 * 10/35 = 50/35 = 10/7 = 1 3/7 0,75x + 6 = -7x + 21 7,75x = 15 / : 7,75 x = 15 * 100/775 = 1500/775 = 300/155 = 60/31 = 1 29/31 0,25x + 1 = 9x + 2 -8,75x = 1 / : (-8,75) x = -100/875 = -20/175 = -4/35 :)
1) 3x*(2+6)=-2+6x 3x*8=-2+6x 24x=-2+6x 24x-6x=-2 18x=-2 /:18 x=-2/18 x=-1/9 2) 2*(x+2x)=24-7x 2x+4x=24-7x 6x+7x=24 13x=24 /:13 x=24/13 x=1 11/13 3) 1/2(x+6)=-3x+8 1/2x+3=-3x+8 1/2x+3x=8-3 3 1/2x=5 /:3 1/2 x=5 : 3 1/2 x=5:7/2 x=5*2/7 x=10/7 x=1 3/7 4) 3/4(x+8)=-7x+21 3/4x+6=-7x+21 3/4x+7x=21-6 7 3/4x=15 31/4x=15 /*4/31 x=15*4/31 x=60/31 x=1 29/31 5) 0,25(x+4)=7+9x-5 1/4x+1=9x+2 1/4x-9x=2-1 -8 3/4x=1 -35/4x=1 /*(-4/35) x= -4/35
