f(x) = 2x + (-5)
f (-1) = 2.(-1) - 5
a = -2 - 5 = -7
f(b) = 2.b - 5
7 = 2b - 5
7+5= 2b
12/2 = b
6 = b
a + b = -7 + 6 = -1
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f(x) = 2x + (-5)
f (-1) = 2.(-1) - 5
a = -2 - 5 = -7
f(b) = 2.b - 5
7 = 2b - 5
7+5= 2b
12/2 = b
6 = b
a + b = -7 + 6 = -1