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y in (-oo:+oo)
6*y-(7/2)+8/4 = 12*y+9/4 // - 12*y+9/4
6*y-(12*y)-(7/2)+8/4-(9/4) = 0
6*y-12*y-7/2+8/4-9/4 = 0
-6*y-15/4 = 0 // + 15/4
-6*y = 15/4 // : -6
y = 15/4/(-6)
y = -5/8
y = -5/8
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