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x in (-oo:+oo)
2.1/1.4 = x/6 // - x/6
2.1/1.4-(x/6) = 0
1.5-1/6*x = 0 // - 1.5
-1/6*x = -1.5 // : -1/6
x = -1.5/(-1/6)
x = 8.99999982
x = 8.99999982
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