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We have, 2a + 24 = 30or, 2a = 30-24or, 2a = 6or, a = 6/2 = 3.Therefore, a equals 3 or simply a=3
2a+5a=3 7a=3 a=3/7 or .4286
a = 4
a=5
a + a + a - 2a = 3a - 2a = a