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15x + 8 = 53

15x = 53-8 = 45

x = 45/15 = 3

So firstly, the first two columns in the periodic table are classed as the 's' group, the next 10 groups/columns, which are the transition metals are called the 'd' group, the last 6 colums are classified...

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1. This process of events is called mitosis (1)

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B. Brötchen