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x in (-oo:+oo)
X/5 = 14-(4*x) // - 14-(4*x)
X/5+4*x-14 = 0
1/5*X+4*x-14 = 0 // - 1/5*X-14
4*x = -(1/5*X-14) // : 4
x = (-(1/5*X-14))/4
x = (14-(1/5*X))/4
x = (14-(1/5*X))/4
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