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x in (-oo:+oo)
(1/2)*(x/18) = 19 // - 19
(1/2)*(x/18)-19 = 0
1/36*x-19 = 0 // + 19
1/36*x = 19 // : 1/36
x = 19/1/36
x = 684
x = 684
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