Question

(x+1)+(x+3)+(x+5)+...+(x+21)=0

Answer 1

( x + 1 ) + ( x + 3 ) + ... + ( x + 21 ) = 0

( x + x + x + .... + x ) + ( 1 + 3 + 5 + ... + 21 ) = 0

11x + 121 = 0

11x = 0 - 121

11x = - 121

x = ( - 121 ) : 11

x = - 11

Answer 2

=>(x+x+....+x) +(1+2+3+..+21)=0

21x+231=0

=>21x=-231

=>x=-231:21=-11