7/10 + 2/15 = (7x3)/(10x3) + (2x2)/(15x2)
= 21/30 + 4/30
= 25/30
si tu sais simplifier = 5/6
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7/10 + 2/15 = (7x3)/(10x3) + (2x2)/(15x2)
= 21/30 + 4/30
= 25/30
si tu sais simplifier = 5/6