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x in (-oo:+oo)
(-2*x)/7 = 6/21 // - 6/21
(-2*x)/7-(6/21) = 0
(-2*x)/7-2/7 = 0
-2/7*x-2/7 = 0 // + 2/7
-2/7*x = 2/7 // : -2/7
x = 2/7/(-2/7)
x = -1
x = -1
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