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]