trei + 2 x cat fac 9?
trei + sase fac 9
2 * cat fac 6?
3=x : 4 -12
Cat - 12= 3?
15 = x : 4
Cat impartit la 4 dau 15?
x=60
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Sau metoda algebrica:
2(x : 4 - 12) = 9-3
2(x : 4 - 12) = 6 I : 2
x : 4 - 12 = 3
x : 4 = 12+3
x : 4 = 15
x = 4 x 15 = 60
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