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2b -5(2b+3z)+2(2b-4z)=-10b-15z+4b-8z= -6b-23z
2a 8(x+4)-5(x+4)= 8x+32-5x-20=3x+12=3(x+4)
2b 7(x -3)-(x-3)= 7x-21-x+3=6x-18= 6(x-3)
2c 0,2(-10+x)-(x-10)=-2+0.2x-x+10= -0.8x+8= -0.8(x-10)
nie wiem co jest do liczenia w 3 :)