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x in (-oo:+oo)
7.5 = (3*x)/2 // - (3*x)/2
7.5-((3*x)/2) = 0
(-3/2)*x+7.5 = 0
7.5-3/2*x = 0 // - 7.5
-3/2*x = -7.5 // : -3/2
x = -7.5/(-3/2)
x = 5
x = 5
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