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x in (-oo:+oo)
X = (1/2)*(2*x-30+30) // - (1/2)*(2*x-30+30)
X-((1/2)*(2*x-30+30)) = 0
(-1/2)*(2*x-30+30)+X = 0
X-1/2*2*x = 0
X-1/2*2*x = 0
X-x = 0
X-x = 0
X-x = 0 // - X
-x = -X // * -1
x = X
x = X
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