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5a + 7a > 45 + 15
12a > 60
a > 60/12
a > 5
[5; + ∞[
Verificamos
5a - 15 > - 7a + 45
5 (5) - 15 > - 7 (5) + 45
25 - 15 > - 35 + 45
10 > 10