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x in (-oo:+oo)
(1/5)*x = -9/10 // + -9/10
(1/5)*x-(-9/10) = 0
(1/5)*x+9/10 = 0
1/5*x+9/10 = 0 // - 9/10
1/5*x = -9/10 // : 1/5
x = -9/10/1/5
x = -9/2
x = -9/2
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