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