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(2/7)*(21*y+14)-(2*(4*y+5)) = 0
(2/7)*(21*y+14)-2*(4*y+5) = 0
2/7*(21*y+14)-2*(4*y+5) = 0
2/7*(21*y+14)-2*(4*y+5) = 0
-2*y-6 = 0
-2*y-6 = 0
-2*y-6 = 0 // + 6
-2*y = 6 // : -2
y = 6/(-2)
y = -3
y = -3
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