15-2x=12.9 9x+6x=4.8
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
4x+3x=20.3 2.5(x-4)=20 5x-0.45x2=3.6
12(x+5)=10(x+15)
2(x-13)=x+8×2+13
4.2-x=2.5 2(x+14)=46
☆4.8÷(x+3)=1.2 0.3x+1.5x=1.98