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((2/1)/5)*x = 55 // - 55
((2/1)/5)*x-55 = 0
(2/5)*x-55 = 0
2/5*x-55 = 0 // + 55
2/5*x = 55 // : 2/5
x = 55/2/5
x = 275/2
x = 275/2
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