3 sqrt(20) -3 sqrt(45) + 5 sqrt(12)
3 sqrt (4*5) - 3 sqrt(9*5) + 5 sqrt(4*3)
3 sqrt(4) *sqrt(5) - 3 sqrt(9)sqrt(5) + 5sqrt(4) sqrt(3)
3*2 sqrt(5) - 3*3*sqrt(5) +5*2*sqrt(3)
6 sqrt(5) -9sqrt(5) +10sqrt(3)
-3 sqrt(5)+10sqrt(3)
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