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