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-2.3*x = -31/9 // + -31/9
-2.3*x-(-31/9) = 0
31/9-2.3*x = 0
31/9-2.3*x = 0 // - 31/9
-2.3*x = -31/9 // : -2.3
x = -31/9/(-2.3)
x = 1.49758454
x = 1.49758454
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