Răspuns:
Explicație pas cu pas:
a) x = 3 ; m = ?
4(m-1)x - 5mx + 7 = 2m-6 <=>
4(m-1)·3 - 5m·3 + 7 = 2m-6 <=>
12m-12 - 15m +7 = 2m -6
-3m-5 = 2m-6 =>
2m+3m = -5+6
5m = 1 => m = 1/5
b) x = -2 ; m = ?
3(m-2)x-2mx+9 = 5m +56 <=>
3(m-2)·(-2) -2m·(-2)+9 = 5m+56 =>
-6(m-2) +4m+9 = 5m+56 <=>
-6m+12+4m+9 = 5m+56 =>
-2m+21 = 5m +56 =>
5m+2m = 21-56 =>
7m = -35 =>
m = -35:7 =>
m = -5
#copaceibrainly
