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= AB + BC + CD + DA
= 2x + (3x - 17) + (15 - x) + (5 + x)
= 2x + 3x - 17 + 15 - 1x + 5 + 1x
= 5x + 3
Karena kelilingnya 53 cm maka
Keliling = 5x + 3
53 = 5x + 3
53 - 3 = 5x
50 = 5x
x = 50 / 5
x = 10
Jadi nilai x adalah 10.
Semoga membantu... ^_^