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2 ( x+5 + 3x+4) = 258
2(4x +9) = 258
4x +9 =129
4x = 120
x = 30
B. p = x +5= 30+5= 35cm
L = 3x +4 = 94
C. Luas = P x l = 35 x 94= 3.290 cm²