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x in (-oo:+oo)
(1/9)*(x+36) = 31 // - 31
(1/9)*(x+36)-31 = 0
1/9*(x+36)-31 = 0
1/9*(x+36)-31 = 0
1/9*x-27 = 0
1/9*x-27 = 0
1/9*x-27 = 0 // + 27
1/9*x = 27 // : 1/9
x = 27/1/9
x = 243
x = 243
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