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(15+3) / (15 - 3) solve within the parenthesis first

18/12 Then simplify the fraction

3/2 or 1 1/2

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The above answer has assumed parentheses when none were specified.

15 plus 3 over 15 minus 3 is 15 + 3 / 15 - 3

division comes first so: 15 + 0.2 - 3

then addition: 15.2 - 3

then subtraction: 12.2

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13y ago

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