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2(x+5) + 7 < x + 20 = ?

Răspuns :

2(x+5) + 7 < x + 20
2x + 10 + 7 < x + 20
2x + 17 < x + 20
2x - x + 17 < 20
x + 17 < 20
x < 3
x = 0,1,2
2(x+5)+7<x+20=?
(x+5)+7<x=20/2
(x+5)+7<x=10
(x+5)<x=10-7
(x+5)<x=3
5+3=8
cred ca este bun