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33300=2[(p+l)+(p+t)+(l+t)]
33300=2[(6x.5x)+(6x.4x)+(5x.4x)]
33300=2[30x*+24x*+20x*]
33300=2[74x*]
33300=148x*
x*=33300/148
x=√225
x=15
catatan:
*= pangkat 2 ( kuadrat )