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x in (-oo:+oo)
x-(3/2) = (4*x)/5 // - (4*x)/5
x-((4*x)/5)-(3/2) = 0
x+(-4/5)*x-3/2 = 0
1/5*x-3/2 = 0 // + 3/2
1/5*x = 3/2 // : 1/5
x = 3/2/1/5
x = 15/2
x = 15/2
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