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(2/7)*(21*y+14)-(2*(4*y+6)) = 0
(2/7)*(21*y+14)-2*(4*y+6) = 0
2/7*(21*y+14)-2*(4*y+6) = 0
2/7*(21*y+14)-2*(4*y+6) = 0
-2*y-8 = 0
-2*y-8 = 0
-2*y-8 = 0 // + 8
-2*y = 8 // : -2
y = 8/(-2)
y = -4
y = -4
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