<span>3x-y=18
y = 3x - 18 = 3(x - 6)
x = (18 + y)/3</span>
(1 3/5+1,8)*1/2
0,8+0,9 = 1,7
5/12×4+7=8 2/3 2)4/9×6+2/3=2 2/3+2/3=2 4/3=3 1/3 3)2/5+1 1/4×2=2/5+5/2=29/10=29 9/10 4)29 3/10×5+1/2=23/10×5+1/2=23/2+1/2=24/2=12
4х + 5/13 = 8/9
4х = 8/9 - 5/13
4х = 59/117
х = 59/117 : 4
х = 59/468