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[tex]x \times \frac{2}{5} = x - 30[/tex]


Răspuns :

2x/5=x-30
2x=5x-150
5x-150=2x
5x-2x=150
3x=150
x=150:3
x=50
2x/5 = x - 30

2x = 5(x - 30)

2x = 5x - 150

150 = 5x - 2x

3x = 150

x = 50