3(x-2)=5(2x+3) -> 3x-6=10x+15 -> -7x=21 -> x=-3
2(0.3x-4)-5(0.2x+3)=9 -> 0.6x-8-x-15=9 -> -0.4x=32 -> x=-80
x/2-7=5+x -> x-14=10+2x -> x=-24