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(8x+48):5 + 10x/4 = 4x+12
2x=48
x=24
1 prostokąt - boki 24 i 30 cm
30 x 8/10 = 24
24 x 5/4 = 30
Obw=2x24+2x30=48+60=108
Prostokąty miały obwód 108 cm