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-4*x-(4/5) = (-2/5)*x // - (-2/5)*x
-4*x-((-2/5)*x)-(4/5) = 0
(2/5)*x-4*x-4/5 = 0
-18/5*x-4/5 = 0 // + 4/5
-18/5*x = 4/5 // : -18/5
x = 4/5/(-18/5)
x = -2/9
x = -2/9
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