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=4x-6+6-7
f(2x-3) =2(2x-3)-1
f(x) = 2x-1
f(17)-f(7)=33-13=20
2x = y + 3
x = y/2 + 3/2
f(x) = 4(x/2 + 3/2) -7
f(x) = 2x + 6 -7
f(x) = 2x -1
f(17) = 2(17) - 1 = 34 -1 =33
f(7) = 2(7) - 1 =14 -1 =13
f(17) - f(7) = 33 -13 = 20