2x - 3x = -x
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2x minus 3x is equal to -x.
x(3x - 2)
3x - x = (3 - 1)x = 2x
I assume you wish to simplify the expression (x - 2)/(3x + 9) . (2x + 6)/(2x - 4) = (x - 2)(2x + 6) / [(3x + 9)(2x - 4)] = 2(x - 2)(x + 3) / [6(x + 3)(x - 2)] = 1/3.
2x+3y=13 3x-y=3 x=2