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y in (-oo:+oo)
28-((2/3)*(6*y+15)) = 8*y-6 // - 8*y-6
6-((2/3)*(6*y+15))-(8*y)+28 = 0
(-2/3)*(6*y+15)-8*y+6+28 = 0
6-2/3*(6*y+15)-8*y+28 = 0
6-2/3*(6*y+15)-8*y+28 = 0
6-12*y-10+28 = 0
28-12*y-4 = 0
24-12*y = 0
24-12*y = 0
24-12*y = 0 // - 24
-12*y = -24 // : -12
y = -24/(-12)
y = 2
y = 2
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