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2( ( 2x -1) + (x) ) = 46
3x - 1 = 46/2
3x - 1 = 23
3x = 24
x = 24/3 = 8
P= 2x-1= 16-1= 15
L = x = 8
P x l = Luas = 15 x 8 = 120cm²