[ x + 5y ] is a number that depends on the values of 'x' and 'y'.
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It equals x+5y simplified
- X + 5Y - 4X + 7 gather terms - X - 4X ( same as - X + (- 4X ) 5Y 7 = - 5X + 5Y + 7 ----------------
5y + x = 0 subtract 5y from each side, then x = -5y
x=(-5y-1)/3
(x + 5y)(x + 7y)