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if y = 2x then x = log2 y
x=(y-3)/2
y=x+2/4 (x+2 is all over four)
If y is equal to -4 there is not a multiplicative inverse. If y is different than -4 the inverse is: -1/(4+y)
do you mean y = 2x + 8 ? the inverse is y = (x - 8)/2