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5x + 10x + 70 = 100
15x = 30
x = 2
luego
5 - 6a + 2 (a - 3) = - 2
5 - 6a + 2a - 6 = - 2
- 1 - 4a = - 2
- 1 + 2 = 4a
1 = 4a ⇒ a = 1 / 4
suerte