Balok berukuran (3×+2)cm,lebar=(x+5)cm,tinggi=(2×-4)cm. panjang rusuk 156cm maka nilai x adalah??

Rusuk = keliling

Keliling = 4 (p + l + t)
156 = 4 [(3x+2) + (x+5) + (2x-4)]
156 = 4 (6x + 3)
156 = 24x + 12
156 – 12 = 24x
144 = 24x
x = 144 / 24
x = 6

*maaf kalau salah