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y in (-oo:+oo)
(10*(y+12))/2 = 100 // - 100
(10*(y+12))/2-100 = 0
(10*(y+12))/2+(-100*2)/2 = 0
10*(y+12)-100*2 = 0
10*y-80 = 0
(10*y-80)/2 = 0
(10*y-80)/2 = 0 // * 2
10*y-80 = 0
10*y-80 = 0 // + 80
10*y = 80 // : 10
y = 80/10
y = 8
y = 8
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