a) 5x=15 => x=3
b)4x=4 => x=1
c) -3x=-12 => x=4
d) -2x=200 => x=-100
e)42=7x=> x=6
f)10x=-11 => x=-1,1
Dar x€Z
=> x nu are sol reale
g) 3x=10 => x=10/3
dar x€Z
h)-1+2x=-37
2x=-36=>x=-18
Răspuns:
a)5x-15=0/+15
5x=15/:5=
x=3
c)-3x+11=-1/-11
-3x=-12/:(-3)
x=+4
e)21=7x-21
21+21=7x
42=7x
7x=42/:7
x=6
g)2x+x=-20-10
3x=-30/:3
x=-10
