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(2/7)*(21*y+14)-(2*(4*y+3)) = 0
(2/7)*(21*y+14)-2*(4*y+3) = 0
2/7*(21*y+14)-2*(4*y+3) = 0
2/7*(21*y+14)-2*(4*y+3) = 0
-2*y-2 = 0
-2*y-2 = 0
-2*y-2 = 0 // + 2
-2*y = 2 // : -2
y = 2/(-2)
y = -1
y = -1
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