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2. -3a + 6b
3. 2x^2 + 10x -3x -15 = 2x^2 +7x-15
4. 5m^2 + 20m -m -4 = 5m^2 + 19m - 4
2. -3(a-2b)= -3a+6b
3. (2x-1)(x+5)=2xkuadrat dikali -1x -5
4. (5m-1)(m+4)= 5m kuadrat -1m -4