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x in (-oo:+oo)
X/3-(x/4) = 20 // - 20
X/3-(x/4)-20 = 0
1/3*X-1/4*x-20 = 0 // - 1/3*X-20
-1/4*x = -(1/3*X-20) // : -1/4
x = (-(1/3*X-20))/(-1/4)
x = -4*(20-(1/3*X))
x = -4*(20-(1/3*X))
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