wyznaczając x ze wzoru 4c + d = 2x -a / 2b otrzymamy ? odp. poprawna to a/2 +b(4c +d) /- ułamek
4c + d = (2x - a)/ 2b | * 2b
8bc + 2bd = 2x - a | + a
8bc + 2bd + a = 2x | /2
4bc + bd + a/2 = x
b(4c + d) + a/2 = x
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4c + d = (2x - a)/ 2b | * 2b
8bc + 2bd = 2x - a | + a
8bc + 2bd + a = 2x | /2
4bc + bd + a/2 = x
b(4c + d) + a/2 = x