x-1/2=3/4
x-1/2+1/2=3/4+1/2
x=3/4+2/4
x=5/4;
x+7/8=5/4
x+7/8-7/8=5/4-7/8
x=10/8-7/8
x=3/8;
x-14/15=1/2
x-14/15+14/15=1/2+14/15
x=15/30+28/30
x=43/30
x-1/2=3/4
x-1/2+1/2=3/4+1/2
x=5/4
x+7/8=5/4
x+7/8-7/8=5/4-7/8
x=3/8
x-14/15=1/2
x-14/15+14/15=1/2+14/15
x=43/30