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45x - 45 = 135
45x = 180
x = 4 (b)
2. 2(3x+4) + 2(2x-1) = 36
6x+8 + 4x -2 = 36
10x + 6 = 36
10x = 30
x = 3
l = 2(3) - 1 = 5 cm (c)