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4*x+7/9 = -173/9 // + -173/9
4*x+7/9-(-173/9) = 0
4*x+7/9+173/9 = 0
4*x+20 = 0 // - 20
4*x = -20 // : 4
x = -20/4
x = -5
x = -5
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