15 ц 3/8:(2ц 3/4x+5ц 5/6)-1 ц 1/2=3/4
123/8 : ( 11/4x+ 35/6)=3/4+ 3/2
11/4x+ 35/6 = 123/8 : 9/4
11/4х + 35/6= 123/8*4/9
11/4х=41/6-35/6
11/4х=6/6
х=1:11/4
х=4/11
ПРОВЕРИМ
15 ц 3/8:(2ц 3/4* 4/11 +5ц 5/6)-1 ц 1/2=123/8 :(11/4 *4/11+ 5 ц5\6 )-3/2=123/8:6ц 5/6)- 3/2=123/8 *6/41 -3/2=9/4-3/2=9/4-6/4=3/4