2целых1/7х−3целых9/11х+х =−3
( 2 1/7 X ) - ( 3 9/11 X ) + X = - 3 15/7X - 42/11X + X = - 3 X * ( 15/7 - 42/11 + 1 ) = - 3 X * ( 165/77 - 294/77 + 77/77) = - 3 - 52/77 X = - 3 X = - 3 : - 52/77 X = 231/52 X = 4 23/52