3)-17.4-3x=8.2
4)-(x+2)-(3x-12)=6
5)2(x+10)-5(x+2)=-(6+5x)

3)-17.4-3x=8.23x=-17,4-8,23x=-25,6x=-25,6:3x=-25 3/5:3=-128/5*1/3=-128/15x=-8 8/154)-(x+2)-(3x-12)=6-x-2-3x+12=64x=10-64x=4x=15)2(x+10)-5(x+2)=-(6+5x)2x+20-5x-10=-6-5x-3x+5x=-6-102x=-16x=-8