If m ≠ n and (m + n)-1 (m-1 + n-1) = mxny;
show that : x + y + 2 = 0
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If 5x + 1 = 25x - 2; find the value of :
3x - 3 × 23 - x.
If 4x + 3 = 112 + 8 × 4x; find (18x)3x.