(1)1+x-1/8=9/10
1+x-0.125=10.9
x=10.025
(2)x-(1/4+1/6)=7/12
12x-(3+2)=7
12x=12
x=1
(3)3/5+7/10-x=1/20
12+14-20x=1
20x=25
x=1.25