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18=1,5(2a+5) /:1,5
12 = 2a + 5 /-5
7=2a /:2
a=3,5
druga podstawa: a+5 = 3,5+5=8,5
18=(2a-5/2)*3 /razy 2
36=6a-15
6a=51
a=8,5 - pierwsza podstawa
8,5-5=3,5 - druga podstawa