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b-stilou
c-penar
a+b=183
a+c=250
b+c=363
2a+b+c=183+250=433
2a=433-363=60
a=60:2
a=30
b=183-60
b=123
c=250-30
c=220
b = stilou
c = penar
a+b = 183
a+c = 250
b+c = 363
a = ?, b = ? , c = ?
a = 183 - b
c + 183 - b = 250
c - b = 250 - 183
c - b = 67
c = 67 +b
b + 67 +b = 363+2b = 363 - 67
2b = 296
b = 296 : 2
b = 148
c = 67 + 148
c = 215
a = 183 - 148
a = 35