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2x-3x=-20-10
x=30 cm
jadi panjang diagonalnya adalah 2x+10=2.30+10=70 cm
2x+10 = 3x-20
-x = -10
x = 10
maka pnjang diagonal, dng cara substitusikan nilai x ke salah satu diagonal,
pnjng diagonal = 2(10)+10=30