You'll set all of them separately to 0
like this...
x=0
x-5=0
x-2=0
x+3=0
then you solve for x
x=0 will be x=0
x-5=0 will become x=5 because 5 gets added on both sides.
x-2=0 becomes x=2 because 2 gets added on both sides.
x+3=0 becomes x= -3 because 3 gets subtracted from both sides.
So the zeros would be {-3,0,2,5}
and looking at these the smallest zero would be -3.
