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6x-2=2x+10
6x-2x=10+2
4x=12
x=12/4
x=3
6(3)-2
18-2
16
6x - 2x = 10 + 2
4x = 12
x = 3
6x - 2 = 6(3) - 2
= 18 - 2
= 16 cm
Jadi panjang diagonal persegi panjang tersebut adalah 16 cm.