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x in (-oo:+oo)
9 = (7*x)/2 // - (7*x)/2
9-((7*x)/2) = 0
(-7/2)*x+9 = 0
9-7/2*x = 0 // - 9
-7/2*x = -9 // : -7/2
x = -9/(-7/2)
x = 18/7
x = 18/7
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