(x + 9) + (x - 8) + (x + 7) + (x - 6) + (x + 5) + (x - 4) = 63.6, ( x + 9 ) + ( x - 8 ) + ( x + 7 ) + ( x - 6 ) + ( x + 5 ) + ( x - 4 ) = 63.6, (x+9)+(x-8)+(x+7)+(x-6)+(x+5)+(x-4)=63.6