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y in (-oo:+oo)
31-4*y = (1/3)*(9*y+12)-4 // - (1/3)*(9*y+12)-4
4-((1/3)*(9*y+12))-4*y+31 = 0
(-1/3)*(9*y+12)-4*y+4+31 = 0
4-1/3*(9*y+12)-4*y+31 = 0
4-1/3*(9*y+12)-4*y+31 = 0
4-7*y-4+31 = 0
31-7*y = 0
31-7*y = 0
31-7*y = 0 // - 31
-7*y = -31 // : -7
y = -31/(-7)
y = 31/7
y = 31/7
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