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x in (-oo:+oo)
51 = (17*x)/3 // - (17*x)/3
51-((17*x)/3) = 0
(-17/3)*x+51 = 0
51-17/3*x = 0 // - 51
-17/3*x = -51 // : -17/3
x = -51/(-17/3)
x = 9
x = 9
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