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x in (-oo:+oo)
4/5-((4/3)*x) = -1/2 // + -1/2
4/5-((4/3)*x)-(-1/2) = 0
(-4/3)*x+4/5+1/2 = 0
13/10-4/3*x = 0 // - 13/10
-4/3*x = -13/10 // : -4/3
x = -13/10/(-4/3)
x = 39/40
x = 39/40
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