It could be some kind of an algebraic expression.
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5x + 3y - 2 - x + y + 2 = 4x + 4y = 4(x + y)
x + y = 6 so that -x = y - 6 -x + 3y = -2 that is, y - 6 + 3y = -2 or 4y = 4 or y = 1 and then -x = y - 6 = -5 so that x = 5
x+3y=2 x= -5 y = 1
x=-2, y=2
The coefficient of X is 1