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x in (-oo:+oo)
X/2+30 = 3*x-10 // - 3*x-10
X/2-(3*x)+10+30 = 0
X/2-3*x+10+30 = 0
1/2*X-3*x+40 = 0 // - 1/2*X+40
-3*x = -(1/2*X+40) // : -3
x = (-(1/2*X+40))/(-3)
x = (1/2*X+40)/3
x = (1/2*X+40)/3
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