3\4b+1\4b+3b=-8
решите уравнение
(1\4х+5)-(-3\4х-7)=5,2

3/4b + 1/4b + 3b = -81b + 3b = -84b = -8b = -8/ 2b= -2(1/4x + 5) - (-3/4x - 7) = 5,21/4х + 5 - 3/4х -7= 5,20,5х - 2= 5,20,5х= 7,2х= 14,4