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