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2+3=5 ≠ 30
4+6=10 ≠ 30
6+9=15 ≠ 30
12+18=30 = 30
12:18=¹²/₁₈=⁶/₉=²/₃
Te liczby to 12 i 18
y-II liczba
x+y=30
x:y=2/3
x+y=30
2y=3x
x+y=30
y=3/2x
x+3/2x=30
y=3/2x
5/2x=30
y=3/2x
x=30*2/5=12
y=3/2*12=18