-х+(-31 1/3)=40 5/12
-х-31 1/3=40 5/12
-х=40 5/12+31 1/3
-х=485/12+94/3
-х=485/12+376/12=861/12=71,75
х=-71,75
-х+(-31(1/3))=40(5/12)-х-31(4/12)=40(5/14)-х= 40(5/12)+31(4/12)-х=71(9/12)х=-71(3/4)
