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f(-2) = -2(2) +3
= -4 +3
= -1
f(x) = -2x +3
f(3) = -2(3) +3
= -6 +3
= -3
b. f(x) = -2x +3
f(a) = -2(a) +3 = 7
= -2a +3 = 7
= -2a = 7 -3
= -2a = 4
= a = 4 / -2
= a = -2