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x in (-oo:+oo)
(13/20)*x-((1/4)*x) = 34 // - 34
(13/20)*x-((1/4)*x)-34 = 0
(13/20)*x+(-1/4)*x-34 = 0
2/5*x-34 = 0 // + 34
2/5*x = 34 // : 2/5
x = 34/2/5
x = 85
x = 85
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