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y in (-oo:+oo)
4*(-8/7)-(3*y) = 1 // - 1
4*(-8/7)-(3*y)-1 = 0
4*(-8/7)-3*y-1 = 0
-3*y-39/7 = 0 // + 39/7
-3*y = 39/7 // : -3
y = 39/7/(-3)
y = -13/7
y = -13/7
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