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x in (-oo:+oo)
4/5 = -20*x // + -20*x
4/5-(-20*x) = 0
20*x+4/5 = 0
20*x+4/5 = 0 // - 4/5
20*x = -4/5 // : 20
x = -4/5/20
x = -1/25
x = -1/25
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