1. 7x-2x=-30 5x=-30 x=-6
2. -18x+25x=-12-16 7x=-28 x=-4
3. -17x-7x=-28-20 -24x=-48 x=2
4. -2x-x=27-20 -3x=7 x=-(7/3)=-2 1/3
5. 0.2x-0.4x=-6.5-4.3 -0.2x=-10.8 x=54
6. 0.6x-0.9x=1-100 -0.3x=-99 x=330
7. -9/14x+2/3x=17-18 1/42x=-1 x=-42
8. -8/15x-4/9x=11+11 -44/45x=22 x=-45/2 x=-22 1/2