3+2×(x:4-12)=9
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Răspuns :

Explicație pas cu pas:

3+2×(x:4-12)=9

2×(x:4-12)=9-3

2×(x:4-12)=6

x:4-12=6:2

x:4-12=3

x:4=12+3

x:4=15

x=15×4

x=60

Coroana????

[tex]3+2*(x:4-12)=9\\3+2*(\frac{1}{4} x-12)=9\\3+\frac{2}{4} x-24=9\\3+\frac{1}{2} x-24=9\\-21+\frac{1}{2} x=9 |*2\\-42+x=18\\x=18+42=60[/tex]