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x in (-oo:+oo)
1/3-7*x = 64/3 // - 64/3
1/3-7*x-(64/3) = 0
1/3-7*x-64/3 = 0
-7*x-21 = 0 // + 21
-7*x = 21 // : -7
x = 21/(-7)
x = -3
x = -3
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