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= f (-6) = 10-3(-6)
= 10+18=28
f(2)= 10-3(2) = 10-6= 4
f(-5) = 10-15 = -5
f(-6) = 10 + 18 = 28
f(2) = 10 - 6 = 4
f(-5) = 10 + 15 = 25
b.
25 = 10 - 3x
25 - 10 = -3x
3x = -15
x = -5