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x in (-oo:+oo)
7*x-7 = (2*x)/13 // - (2*x)/13
7*x-((2*x)/13)-7 = 0
7*x+(-2/13)*x-7 = 0
89/13*x-7 = 0 // + 7
89/13*x = 7 // : 89/13
x = 7/89/13
x = 91/89
x = 91/89
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