Week 13 blog post Adding fractions with variables

 

at first adding and subtracting is all very simple and it all comes around to one common thing among all addition questions, the common denominator.

no question with a different denominator does not work with addition or subtraction, they must have the same.

For our question our common denominator was 15x

so we multiplied the first side by 5 making it 20/15x and the second side by 3 making it 3/15x

adding these is just one step now because of the common denominator

it is 23/15x

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