a) 3x-2=2x-3<=>3x-2x=-3+2<=>x=-1
b) 2x+3=5x+9<=>2x-5x=9-3<=>x=-2
c) 5-2x=7<=>x=-1
d)10x+3-5x=4x+12<=>10x-5x-4x=12-3<=>x=9
e)11x+42-2x=100-9x-22<=>11x-2x+9x=100-42-22<=>x=2
f) 2x-(3-5x)=4(x+3)<=>2x-3+5x=4x+12<=>2x+5x-4x=3+12<=>x=5
g) x(x+2)=x(x+3)<=>x^2+2x=x^2+3x<=>x=0
h) 2(x-3)+5x(x-1)=5x^2<=>2x-6+5x^2-5x=5x^2<=>2x-5x=6<=>x=-2