[s+t]/5 + 2[s+t] /15
place both terms over common denominator 15
3[s+t]/15 +2[s+t]/15
place over common denominator
{ 3[s+t]+2[s+t] } /15
combine , or factor out [s+t]
5[s+t]/15
divide numerator and denominator by 5
[s+t]/3 answer
Arthur
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