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L = (x + 1) cm
a. Keliling = 2x(p+l) = 2((3x - 4)+(x + 1))
= 2(4x - 3)
= 8x - 6 cm
b. 34 = 8x - 6 cm
= 34 + 6 = 8x
= 40 = 8x
Jadi. x = 5.