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F(2x-3) = 4x +5
2x - 3 = - 7
2x = - 7 +3
X = - 2

F(-7) = 4x + 5
F (-7) = 4.-2 +5
F(-7) = - 3

f(x) = ax+b
f(2x-3) = 4x+5
= a(2x-3)+b
= 2(2x-3)+b
= 4x-6+b = 4x+5
= 4x-4x+b = 5+6
b = 11
a = 2

f(-7) = ax+b
f(-7) = 2(-7)+11
f(-7) = -14+11 = -3