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x in (-oo:+oo)
A = (9/2)*(x+28) // - (9/2)*(x+28)
A-((9/2)*(x+28)) = 0
(-9/2)*(x+28)+A = 0
A-9/2*(x+28) = 0
A-9/2*(x+28) = 0
A-9/2*x-126 = 0
A-9/2*x-126 = 0
A-9/2*x-126 = 0 // - A-126
-9/2*x = -(A-126) // : -9/2
x = (-(A-126))/(-9/2)
x = -2/9*(126-A)
x = -2/9*(126-A)
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