:)

a) 3x-6/3 -5 /*3 3x-6-15=3x-21 b) 3a-9b/3 - 2a-4b/2 /*6 2(3a-9b)-3(2a-4b)=6a-18b-6a+12b=-6b c) 2x+6/2 - 6x-9/3 /*6 3(2x+6)-2(6x-9)=6x+18-12x+18=-6x+36 d) 4- x-7/2 +9 - x-1/3 /*6 24-3(x-7)+54-2(x-1)=24-3x+21+54-2x+2=101+x