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x in (-oo:+oo)
-7*((2*x)/11) = 6 // - 6
-7*((2*x)/11)-6 = 0
-14/11*x-6 = 0 // + 6
-14/11*x = 6 // : -14/11
x = 6/(-14/11)
x = -33/7
x = -33/7
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