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3x=4y
x/4=y/3=k
x=4k
y=3k
4k+3k=210
7k=210
k=30
x=4*30=120
y=3*30=90
3a = 4 b = k ⇒ a = k/3; ⇒ b = k/4
k/3 + k/4 = 210 → le aduc la acelasi numitor comun
4 k + 3 k = 12 × 210
7 k = 2 520
k = 2 520 : 7
k = 360
a = 360 : 3 = 120
b = 360 : 4 = 90
Verific: 120 + 90 = 210 → suma celor doua numere