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x in (-oo:+oo)
3-((4*x)/5) = x/5+4 // - x/5+4
3-((4*x)/5)-(x/5)-4 = 0
(-4/5)*x-(x/5)-4+3 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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