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