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x in (-oo:+oo)
3/4 = (15/2)*x // - (15/2)*x
3/4-((15/2)*x) = 0
(-15/2)*x+3/4 = 0
3/4-15/2*x = 0 // - 3/4
-15/2*x = -3/4 // : -15/2
x = -3/4/(-15/2)
x = 1/10
x = 1/10
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