7x-5/4=3/8

1.7x=3/8+5/4 x=(3/8+5/4)/7 = 13/56
2.2x-5x=1/8+1/6 -3x=15/24 x= -5/24
3.1/2x-9x=-2/6+7 -17/2x= 20/3 x= -40/51
4.-3x=1-1/3+1/6 -3x=5/6 x= - 5/18
5.3/10*200+3/10*x - 2/10*300+2/10*x = 300*9/25
3/10*x+2/10*x = 300*9/25
5/10*x = 300*9/25
x=300*9/25*10/5
=216