-1 7/12-1 3/4х=1/8

-1 3/4х=1/8+1 7/12

-1 3/4х=12/96+1 56/96

-1 3/4х=1 68/96

-1 72/96х=1 68/96

х=1 68/96:(-1 72/96)

х=164/96:(-168/96)

х=-1 (примерно округлила)