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5*x-((53/2)*x)+85 = 51 // - 51
5*x-((53/2)*x)-51+85 = 0
5*x+(-53/2)*x-51+85 = 0
34-43/2*x = 0 // - 34
-43/2*x = -34 // : -43/2
x = -34/(-43/2)
x = 68/43
x = 68/43
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