<span>218+х=1000-248</span>
4,5х=2 19/28-3/4
4,5х=2 -2/28
4,5х=1 13/14
х=1 13/14 : 4 1/2
х=27/14 : 9/2
х=27/14 * 2/9
х=3/7
(2x-1/8x)=1/3*1/2
(16/8x-1/8x)=1/6
15/8x=1/6
x=1/6:15/8
x=4/45