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50 cm = 2 [(3x+7)+(2x + 3)]
= 2 [(3x + 2x) + (7 + 3)]
= 2 (5x + 10)
= 10x + 20
10x = 50 - 20
= 30
x = 30 : 10
= 3
Panjang = 3x + 7
= 3.10 + 7
= 30+7
= 37 cm
Lebar = 2x + 3
= 2.10 + 3
= 20 + 3
= 23 cm
Moga membantu ^_^