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x in (-oo:+oo)
(1/15)*x+(1/18)*x = 11 // - 11
(1/15)*x+(1/18)*x-11 = 0
11/90*x-11 = 0 // + 11
11/90*x = 11 // : 11/90
x = 11/11/90
x = 90
x = 90
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