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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
* * * * *
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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