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4/5-4*x = -3/2-(2/5) // + -3/2-(2/5)
4/5-4*x-(-3/2)+2/5 = 0
4/5-4*x+3/2+2/5 = 0
27/10-4*x = 0 // - 27/10
-4*x = -27/10 // : -4
x = -27/10/(-4)
x = 27/40
x = 27/40
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