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20 = 2(5x - 3 + 3x - 1)
20 = 2(8x - 4)
20 = 16x - 8
20 + 8 = 16x
28 = 16x
28 : 16 = x
1,75 = x
a) maka nilai x = 1,75
b)
panjang = 5x - 3 = 5(1,75) - 3 = 5,75 m
lebar = 3x - 1 = 3(1,75) - 1 = 4,25 m