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x in (-oo:+oo)
x-(3/9) = (7*x)/2 // - (7*x)/2
x-((7*x)/2)-(3/9) = 0
x+(-7/2)*x-1/3 = 0
-5/2*x-1/3 = 0 // + 1/3
-5/2*x = 1/3 // : -5/2
x = 1/3/(-5/2)
x = -2/15
x = -2/15
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