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-4a + 8a = 1 + 15
4a = 16
a = 16/4
a = 4
2) 6 / a+2 = 4
6 = 4 (a+2)
6 = 4a + 8
4a = 6 - 8
4a = -2
a = -2 / 4
a = - 0,5