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x in (-oo:+oo)
1-((8/10)*x) = 8/2 // - 8/2
1-((8/10)*x)-(8/2) = 0
(-4/5)*x-4+1 = 0
-4/5*x-3 = 0 // + 3
-4/5*x = 3 // : -4/5
x = 3/(-4/5)
x = -15/4
x = -15/4
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