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x in (-oo:+oo)
4*x+7 = (77/3)*x // - (77/3)*x
4*x-((77/3)*x)+7 = 0
4*x+(-77/3)*x+7 = 0
7-65/3*x = 0 // - 7
-65/3*x = -7 // : -65/3
x = -7/(-65/3)
x = 21/65
x = 21/65
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