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x in (-oo:+oo)
(10/15)*x = 70/45 // - 70/45
(10/15)*x-(70/45) = 0
(10/15)*x-14/9 = 0
2/3*x-14/9 = 0 // + 14/9
2/3*x = 14/9 // : 2/3
x = 14/9/2/3
x = 7/3
x = 7/3
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