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2x+3=45

68+2x=42

5x-2x=42​


Răspuns :

Răspuns:

2x + 3=45

2x=45-3

2x=42

x=42:2

x=21

68+2x=42

2x=42-68

2x=-26

x= -26:2

x=-13

5x-2x=42

3x=42

x= 42:3

x=14