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2*x+1/5 = -3/10 // + -3/10
2*x+1/5-(-3/10) = 0
2*x+1/5+3/10 = 0
2*x+1/2 = 0 // - 1/2
2*x = -1/2 // : 2
x = -1/2/2
x = -1/4
x = -1/4
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