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x in (-oo:+oo)
13 = (4/3)*(4*x+9) // - (4/3)*(4*x+9)
13-((4/3)*(4*x+9)) = 0
(-4/3)*(4*x+9)+13 = 0
13-4/3*(4*x+9) = 0
13-4/3*(4*x+9) = 0
1-16/3*x = 0
1-16/3*x = 0
1-16/3*x = 0 // - 1
-16/3*x = -1 // : -16/3
x = -1/(-16/3)
x = 3/16
x = 3/16
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