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x in (-oo:+oo)
2/7-6*x = 3*x+65/7 // - 3*x+65/7
2/7-6*x-(3*x)-(65/7) = 0
2/7-6*x-3*x-65/7 = 0
-9*x-9 = 0 // + 9
-9*x = 9 // : -9
x = 9/(-9)
x = -1
x = -1
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