Find all real values of x for which f(x) = 0. 1. f(x) = 15 3x

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Find all real values of x for which f(x) = 0.
1. f(x) = 15 − 3x
2. f(x) = 4x + 6
3. f(x) = 3x - 4/5
4. f(x) = 12 − x2/8
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