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5-złotówki - 40-x
złotówki - 1
1+2x+5(40-x) = 150
1+2x+200-5x = 150
2x-5x = 150-200-1
-3x = -51 |:(-3)
x = 17
2-złotówki - 17
5-złotówki - 40-17 = 23