We want to find the value of x that makes f(x) = 5(x – 3) + 17 equal to 12
5(x – 3) + 17 = 12
5x - 5*3 + 17 = 12
5x -15 + 17 = 12
5x + 2 = 12
5x = 12 - 2
5x = 10
x = 10/5
x = 2
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