Question

Exercițiul 7,va rog!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

a)x-3=a,unde x=-7
-7-3=-10
b)x=7-a,unde x=1
1=7-a
1+a=7
a=6
c)ax+2=-4,unde x=-3
-3×a+2=-4
-3a=-2
a=-2÷-3
a=1.5
d)a÷x+5=-1,unde x=-2
a÷-2+5=-1
a÷-2=-1-5
a÷2=-6
a=2×(-6)
a=-12