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|-7 - 3| - 2a = 3a + 5
|-10| - 2a = 3a + 5
10 - 2a = 3a + 5
-2a - 3a = 5 - 10
-5a = -5 ||:(-5)
a = 1
b)
|x - 3| - 2 * 1 = 3 * 1 + 5
|x - 3| - 2 = 8
|x - 3| = 10
x - 3 = 10 ∨ x - 3 = -10
x = 13 ∨ x = -7