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x in (-oo:+oo)
1/2-(7*x) = -3/22 // + -3/22
1/2-(7*x)-(-3/22) = 0
1/2-7*x+3/22 = 0
7/11-7*x = 0 // - 7/11
-7*x = -7/11 // : -7
x = -7/11/(-7)
x = 1/11
x = 1/11
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