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x in (-oo:+oo)
3-((5*x)/4) = 6 // - 6
3-((5*x)/4)-6 = 0
(-5/4)*x-6+3 = 0
-5/4*x-3 = 0 // + 3
-5/4*x = 3 // : -5/4
x = 3/(-5/4)
x = -12/5
x = -12/5
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