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y in (-oo:+oo)
1/3-((1/2)*y) = -1/7 // + -1/7
1/3-((1/2)*y)-(-1/7) = 0
(-1/2)*y+1/3+1/7 = 0
10/21-1/2*y = 0 // - 10/21
-1/2*y = -10/21 // : -1/2
y = -10/21/(-1/2)
y = 20/21
y = 20/21
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