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y in (-oo:+oo)
(1/4)*(12*y+12)-7 = (-1/9)*(9*y-36) // - (-1/9)*(9*y-36)
(1/4)*(12*y+12)-((-1/9)*(9*y-36))-7 = 0
(1/4)*(12*y+12)+(1/9)*(9*y-36)-7 = 0
1/4*(12*y+12)+1/9*(9*y-36)-7 = 0
1/4*(12*y+12)+1/9*(9*y-36)-7 = 0
4*y-7-1 = 0
4*y-8 = 0
4*y-8 = 0
4*y-8 = 0 // + 8
4*y = 8 // : 4
y = 8/4
y = 2
y = 2
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