X－2/7X=3/470%X + 20%X = 3.6 25% + 10X =4/5 X - 15%X = 68 X＋3/8 X＝1215X－3×5/21 ＝5/11 6X＋5 =13.4 X÷(6/35)=(26/45) ×(13/25) 2(x-0.6)=4 (0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X ...