2.7÷x=3 7×7-3x=40 x-0.85x=3
6(x-3)=24 5(3x+8)=40 (16-2x)÷3=0.4
1.8×15-1.7x=13.4 2(x+6)=13.6 4.2x-x=1.28
15-2x=12.9 9x+6x=4.8