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x in (-oo:+oo)
-3/4 = (3*x)/5 // - (3*x)/5
-((3*x)/5)-3/4 = 0
(-3/5)*x-3/4 = 0
-3/5*x-3/4 = 0 // + 3/4
-3/5*x = 3/4 // : -3/5
x = 3/4/(-3/5)
x = -5/4
x = -5/4
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