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x in (-oo:+oo)
-5*x-(5/2) = 35/2 // - 35/2
-5*x-(5/2)-(35/2) = 0
-5*x-5/2-35/2 = 0
-5*x-20 = 0 // + 20
-5*x = 20 // : -5
x = 20/(-5)
x = -4
x = -4
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