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150 = 15 . (3x + 2) : 2
150 . 2 = 45x + 30
300 = 45x + 30
45x = 300-30
45x = 270
x = 6
d2 = 3x + 2
d2 = 3.6 + 2
d2 = 18+2
d2 = 20