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(-4/5)*(15*y-20) = 2*(2*y+8) // - 2*(2*y+8)
(-4/5)*(15*y-20)-(2*(2*y+8)) = 0
(-4/5)*(15*y-20)-2*(2*y+8) = 0
-4/5*(15*y-20)-2*(2*y+8) = 0
-4/5*(15*y-20)-2*(2*y+8) = 0
-16*y = 0
-16*y = 0
-16*y = 0 // : -16
y = 0
y = 0
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