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SWAG
inverse of the function y = 3x + 7
y = 3x + 7 y-7 = 3x (y-7)/3 = x // just move x to the left x = (y-7)/3 replace all y's for x's and all x's for y's
*replace the x with y^-1 and replace the y with x |dw:1362607650504:dw| After, make the y^-1 subject