Explicație pas cu pas:
a) |x-2|=3 => x-2=3 sau x-2=-3 =>
x=5 sau x=-1 => S€{5,-1}
b)|2x+1|=5 => 2x+1=5 sau 2x+1=-5=>
2x=4 sau 2x=-6 =>x=2 sau x=-3
S€{2,-3}
c)3(2|2x-5|-15)-12=9 => 3(2|2x-5|-15)=21 =>
2|2x-5|-15=7=> 2|2x-5|=22 => |2x-5|=11 =>
2x-5=11 sau 2x-5=-11 => 2x=16 sau 2x=-6 => x=8 sau x=-3 => S€{8,-3}