60ab-120ac+150ad
30a(20b-40c+50d)
30a{10[(2b-4c)+5d)]}
30a{10[2(b-2c)]+5d}
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60ab-120ac+150ad
30a(20b-40c+50d)
30a{10[(2b-4c)+5d)]}
30a{10[2(b-2c)]+5d}