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s = 4 p
rescriem ecuatia ca
7 x 4p + 7p = 140
28 p + 7 p = 140
35 p = 140
p= 140 : 35
p= 4 lei
s = 4 x 4 = 16 lei
Deci un stilou este 16 lei si un pix 4 lei