15целых 3/8 : (2ц 3/4x +5ц 5/6)-1ц 1/2 - 3/4 решить

(15*8+3)/8:((2*4+3)*х/4+(5*6+5)/6)-(1*2+1)/2-3/4=123/8:(15*х/4+35/6)-3/2-3/4=
= 123/8:(приводим к одному знаменателю=12, 4)((3*15*х)+35*2)/12)-6/4-3/4=
=123/8:((45*х+70)/12)-9/4=(перевернём делитель)=123/8*12/(45*х+70)-9/4=
=(9/4=18/8)=(123*12/(8*(45*х+70))-18/8=(123*12-9*(45*х+70))/8*(45*х+70)=
=(1476-405*х-630)/8*(70+45*х)=(846-405*х)/8*(70+45*х)=
=9*(94-45*х)/8*(70+45*х)