3/5x=45 3-3x=1 x-0.9x=9.1 6x-7x=169 3x+x=7.8 x+120%=6.6 9.6÷x=80 (1-25%)x=750 40-x=0.8 80+20x=200 19x+6=291 80%x=120 x+120%x=66 12x+34x=1 18x-14x=12 23 x-5×14=14 12+34x=56 22-14x=12 23x-14x=14 X-5.7=2.15 15 5X-2X=18 3X+0.7=5 3200=450+5X+X X-0.8X=6 x+5.6=9.4 12x=300-4x 7x+5.3=7.4 3x÷5=4.8 30÷x+25=85