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6× p+7×z+15×f= 362 , p=7×f, z=f+6 p, z, f=?va rog ajutatima

Răspuns :

6 x 7xf+ 7 x (f+6) + 15xf= 362
42xf + 7xf + 42 + 15xf = 362
64xf +42 = 362
64xf = 362- 42
64xf = 320
f= 320: 64
f=5