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7*x+2/5 = 0.2 // - 0.2
7*x+2/5-0.2 = 0
7*x+0.2 = 0 // - 0.2
7*x = -0.2 // : 7
x = -0.2/7
x = -0.02857143
x = -0.02857143
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