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(2/5)*x+4 = 236/55 // - 236/55
(2/5)*x-(236/55)+4 = 0
(2/5)*x-236/55+4 = 0
2/5*x-16/55 = 0 // + 16/55
2/5*x = 16/55 // : 2/5
x = 16/55/2/5
x = 8/11
x = 8/11
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