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6x + 15 = 40
6x = 40-15
6x = 25
x = 25/6
x = 4 (dibulatkan)
2x + 5 = 2.4 = 8 + 5 = 13 cm
ml=x
keliling = 2x+5+2x+5+x
=5x+10=40
5x=40-10
5x=30
x=30/5
x=6
2x+5= 2(6)+5
=12+5
=17cm