If your expression mean :
3 / a + 2 / 3 a = 11 / 15
Then :
3 * 3 / ( 3 * a ) + 2 / 3 a = 11 / 15
9 / 3 a + 2 / 3 a = 11 / 15
11 / 3 a = 11 / 15 Multiply both sides by 3a
11 * 3 a / 3 a = 11 * 3 a / 15
11 = 33 a / 15 Multiply both sides by 15
11 * 15 = 33 a
165 = 33 a Divide both sides by 33
165 / 33 = 33 a / 33
5 = a
a = 5
3 over a+2 over 3a =11 over 15
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