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