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9+21-1,5b+b=27
a=21-1,5b
30 - 0,5b =27 /-30
a=21-1,5b
- 0,5b =27-30
a=21-1,5b
- 0,5b = -3 /*(-2)
a=21-1,5b
b = 6
a=21-9
b = 6
a = 12
b = 6
sprawdzenie:
pierwsze rownanie:
6 * 12 +9 * 6 =? 126
72 + 54 =? 126
72 + 54 = 126 ok
drugie rownanie:
2*9+(a+b)*2=? 54
2*9+(12+6)*2=? 54
2*9+18*2=? 54
18+36=? 54
54 = 54 ok