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(-1/5)*x-(5*x)+3 = 2/5 // - 2/5
(-1/5)*x-(5*x)-(2/5)+3 = 0
(-1/5)*x-5*x-2/5+3 = 0
13/5-26/5*x = 0 // - 13/5
-26/5*x = -13/5 // : -26/5
x = -13/5/(-26/5)
x = 1/2
x = 1/2
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