Respuesta:
3/5-3/7 = y m.c.m. 35
21/35 - 15/35 =35y
6/35 =35y
6 /35 = y
3/4 x+2= 1/8
3/4x=1/8-2 mcm(8)
6x=1-16
x=-15/6
X= -5/2
12/7x+3=-8
12/7x=-8-3
12/7x = -11
x= -11:12/7
x= 77/12
3/4+1/3 = n-2/9 mcm 36
27/36+12/36 = 36n/36 -8/36
39/36 =36n/36-8/36
39+8 =36n
47/36 = n
Explicación paso a paso: