3/4x+0.5×0.75=1
3/4x+3/8=1
3/4x=1-3/8
3/4x=5/8
x=5/8÷3/4
x=5/6
1.5×1/2+0.5x=15/4
3/4+0.5x=15/4
0.5x=15/4-3/4
0.5x=3
x=3÷0.5
x=6