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4*x = -3/7 // + -3/7
4*x-(-3/7) = 0
4*x+3/7 = 0
4*x+3/7 = 0 // - 3/7
4*x = -3/7 // : 4
x = -3/7/4
x = -3/28
x = -3/28
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