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7*x = -2/5 // + -2/5
7*x-(-2/5) = 0
7*x+2/5 = 0
7*x+2/5 = 0 // - 2/5
7*x = -2/5 // : 7
x = -2/5/7
x = -2/35
x = -2/35
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