#-12sqrt5#
#3sqrt5-5sqrt+9sqrt5#
#:.=3sqrt5-5sqrt(3*3)sqrt5#
#sqrt3*sqrt3=3#
#:.=3sqrt5-5xx3sqrt5#
#:.=3sqrt5-15sqrt5#
#:.=sqrt5(3-15)#
#:.=-12sqrt5#
How do you simplify #3sqrt5-5sqrt+9sqrt5#?
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