Question

помогите плиз срочно

Answer 1

1) 5x+7x = x(5+7) = 12x 
2) 17a-9a = a(17-9)= 8a
3)34a-a=a(34-1)=33a
4) c+72c=c(1+72)=73c
5)7x+8x+12x= x(7+8+12)=27x
6)53y+18y-24y= y(53+18-24) = 47y
7)14m+15m+16=m(14+15)+16 = 29m+16
8) 69n-n-18=n(69-1)-18=68n-18
9) 25x+37x-17x-x= x(25+37-17-1) =44x