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(7xa+90:10-27:9):8=7

a=.....


Răspuns :

(7a+9-3):8=7
7a+6=56
7a=50
a=50/7
Salut !

[tex](7 \times a + 90:10 - 27:9):8 = 7[/tex]

[tex](7 \times a + 9 - 3):8 = 7[/tex]

[tex](7 \times a + 9 - 3) = 8 \times 7[/tex]

[tex]7 \times a + 9 - 3 = 56[/tex]

[tex]7 \times a + 6 = 56[/tex]

[tex]7 \times a =56-6[/tex]

[tex]7 \times a =50[/tex]

[tex]a = \frac{50}{7} [/tex]

...............