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x+3 - podstawa
42= 3x+3/-3
39=3x/:3
13=x
13+3= 16
a+2c=42cm
a+2(a+3)=42
a+2a+6=42
3a=42-6
3a=36
a=36/3
a=12
c=12+3=15
Ramiona mają po 15cm, a podstawa ma 12 cm