a) -(-30)-(-x)=13 <=>30+x=13 <=>x=13-30 <=>x=-17
b)-(-x)+14=12 <=>x+14=12 <=>x=12-14 <=> x=-2
c)15-x+7=-(-6)+|-12| <=> 15-x+7=6+12 <=> -x=6+12-15-7 <=>-x=-4 <=>x=4
d)-|-5|-(-x)+4=3-(-25) <=>-5+x+4=3+25 <=>x=3+25+5-4 <=>x=29
e)22-2.|x+5|=|-4|+8 <=> 33-2.(x+5)=4+8 <=>33-2x-10 =12 <=>-2x=12-33+10=-2x=-11 <=> x=11/5