30 / x + 25 = 85 the process of solving equation

30 / x + 25 = 85 the process of solving equation

30/X+25=85
30/X=85—25
30/X=60
30=60X
X=1/2
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What equation is (x + 2) (y-4) = XY
Is it binary once or binary twice?

（x+2)(y-4)=xy
xy-4x+2y-8=xy
-4x+2y-8=0
x. Y is an unknown number, and it is a quadratic equation
The key is to look at the quality after simplification

Given x, Y > 0 2x + y + 3 = XY, find the minimum value of 5x + 4Y

If x = 1, then y does not exist and there is no maximum value for 5x + 4Y; if x ≠ 1, then y = (2x + 3) / (x-1), M = 5x + 4Y = 5x + (8x + 12) / (x-1) = (5x & sup2; + 3x + 12) / (x-1). Let t = X-1, then x = t + 1, so m = (5T & sup2; + 13T + 20) / T = 5T + 20 / T + 13