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I presume you mean given y find x:

Make x the subject:

y = 2x + 3

=> 2x + 3 = y

=> 2x = y - 3

=> x = (y - 3)/2

which can also be expressed as:

x = 0.5 y - 1.5

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Q: What is the inverse of y equals 2x plus 3?
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