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x in (-oo:+oo)
(-3/5)*x = 20 // - 20
(-3/5)*x-20 = 0
-3/5*x-20 = 0 // + 20
-3/5*x = 20 // : -3/5
x = 20/(-3/5)
x = -100/3
x = -100/3
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