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2c - 1,5c = 1
0,5c = 1 /0,5
c = 2
cegla wazy 2 kg
2x = 1,5x + 1
2x - 1,5x = 1
0,5x = 1
5x = 10
x = 2kg
Odp.: Cegła waży 2kg
2a-1,5a=1
0,5a=1
a=2