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x in (-oo:+oo)
3-((5*x)/4) = 8 // - 8
3-((5*x)/4)-8 = 0
(-5/4)*x-8+3 = 0
-5/4*x-5 = 0 // + 5
-5/4*x = 5 // : -5/4
x = 5/(-5/4)
x = -4
x = -4
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