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(5/49)*x+25/49 = 20/49 // - 20/49
(5/49)*x+25/49-(20/49) = 0
(5/49)*x+25/49-20/49 = 0
5/49*x+5/49 = 0 // - 5/49
5/49*x = -5/49 // : 5/49
x = -5/49/5/49
x = -1
x = -1
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