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(-2/5)*x = 4/5-((3/5)*x) // - 4/5-((3/5)*x)
(-2/5)*x+(3/5)*x-(4/5) = 0
(-2/5)*x+(3/5)*x-4/5 = 0
1/5*x-4/5 = 0 // + 4/5
1/5*x = 4/5 // : 1/5
x = 4/5/1/5
x = 4
x = 4
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