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x in (-oo:+oo)
(2/7)*x-(3/4) = -13 // + 13
(2/7)*x-(3/4)+13 = 0
(2/7)*x-3/4+13 = 0
2/7*x+49/4 = 0 // - 49/4
2/7*x = -49/4 // : 2/7
x = -49/4/2/7
x = -343/8
x = -343/8
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