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1/2-5*x = (-2/5)*x-(4/5) // - (-2/5)*x-(4/5)
1/2-5*x-((-2/5)*x)+4/5 = 0
(2/5)*x-5*x+1/2+4/5 = 0
13/10-23/5*x = 0 // - 13/10
-23/5*x = -13/10 // : -23/5
x = -13/10/(-23/5)
x = 13/46
x = 13/46
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