To divide these two values, you have to "get rid" of the decimal point first, this way the division will be easier.
So first step is to multiply the denominator by ten to shift the decimal point to the right:
0.2*10=2
Now for the convertion to be equivalent, whatever operation you performed for the denominator must be performed for the numerator, this means that if we multiplied the denominator by 10, we must multiply the numerator by ten:
7.86*10=78.6
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