a: =>x=9/8+7/8=16/8
=>x=2
b: x-2/5=-7/5
=>x=-7/5+2/5=-5/5=-1
c: 6/11-x=8/11
=>x=6/11-8/11=-2/11
d: 15/13-x=4/26=2/13
=>x=15/13-2/13=1
e: =>x=4/9*(-3/7)=-12/63=-4/21
f: =>x=-8/7:4/5=-8/7*5/4=-40/28=-10/7
g: =>x=12/17:3/4=12/17*4/3=16/17
h: =>x=-7/6*8/5=-56/30=-28/15