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x in (-oo:+oo)
(36/7)*x = 9/2 // - 9/2
(36/7)*x-(9/2) = 0
(36/7)*x-9/2 = 0
36/7*x-9/2 = 0 // + 9/2
36/7*x = 9/2 // : 36/7
x = 9/2/36/7
x = 7/8
x = 7/8
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