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a-b+3b+b+2a-b+b=a+3b=2+1,5=3,5
a-b+3b+b+2a-b+b=3a +3b = 3 *2 + 3 * 0,5 = 6 + 1,5 = 7,5
dla "a"=2 dla "b"=0,5
2 + 9*0,5 = 2 + 4,5 = 6,5
a-b+3b+b+2a-b+b=3a+3b
dla "a"=2 dla "b"=0,5
3*2 + 3*0,5 = 6 +1,5 = 7,5