Răspuns :
a) 2 x + 7 = 9
2 x = 9 - 7
2 x = 2 | : 2
x = 1
b) x - 16 = 5
x = 5 + 16
x = 21
c) 3 x = 27 | : 3
x = 9
d) 5 x - 100 = 25
5 x = 25 + 100
5 x = 125 | : 5
x = 25
Răspuns:
a) 2x +7=9
9-7=2
2÷2=1
b) x-16=5
5+16=21
c) 3x=27
27÷3=9
d) 5x-100=25
25+100=125
125÷5=25