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x in (-oo:+oo)
4/5-(4*x) = -6/5 // + -6/5
4/5-(4*x)-(-6/5) = 0
4/5-4*x+6/5 = 0
2-4*x = 0 // - 2
-4*x = -2 // : -4
x = -2/(-4)
x = 1/2
x = 1/2
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