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x in (-oo:+oo)
4 = (3/4)*(9*x+12) // - (3/4)*(9*x+12)
4-((3/4)*(9*x+12)) = 0
(-3/4)*(9*x+12)+4 = 0
4-3/4*(9*x+12) = 0
4-3/4*(9*x+12) = 0
-27/4*x-5 = 0
-27/4*x-5 = 0
-27/4*x-5 = 0 // + 5
-27/4*x = 5 // : -27/4
x = 5/(-27/4)
x = -20/27
x = -20/27
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