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6-a+5-3a+a+4 = 15 - 3a
a+3+5-a+7-3a = 15-3a
6-3a+a+5+4-a = 15-3a
6-a+a+3+6-3a = 15-3a
5-3a+5-a+a+5 = 15-3a
a+4+7-3a+4-a = 15-3a
6-a+5-a+4-a = 15-3a
6-3a+5-a+a+4 = 15-3a
Ten kwadrat jest magiczny.
b)
2x-1+4a-2+x+1 = 3x-2+4a
2x-2+2x+1+3x-1 = 7x-2
3x+1+x-1+3x-2 = 7x-2
2x-1+2x-2+3x+1 = 7x-2
4a-2+2x+1+x-1 = 4a-2+3x
x+1+3x-1+3x-2 = 7x-2
2x-1+2x+1+3x-2 = 7x-2
3x+1+2x+1+x+1 = 6x+3
Ten kwadrat nie jest magiczny.