3 5/6 - 4 1/5 x = -2 7/12
23/6 - 21/5 x = -31/12
-21/5 x = -31/12 - 23/6
-21/5 x = -31/12 - 46/12
-21/5 x = -77/12
x = (-77/12) / (-21/5)
x = (-77/12) * (-5/21)
x = 77/12 * 5/21
x = (11*7)/(4*3) * 5/(3*7)
x = 11/12 * 5/3
x = 55/36 = 1 19/36
Ответ: x = 1 19/36