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7*x = -2/9 // + -2/9
7*x-(-2/9) = 0
7*x+2/9 = 0
7*x+2/9 = 0 // - 2/9
7*x = -2/9 // : 7
x = -2/9/7
x = -2/63
x = -2/63
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