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x in (-oo:+oo)
X-((1/5)*x) = 144 // - 144
X-((1/5)*x)-144 = 0
X+(-1/5)*x-144 = 0
X-1/5*x-144 = 0 // - X-144
-1/5*x = -(X-144) // : -1/5
x = (-(X-144))/(-1/5)
x = -5*(144-X)
x = -5*(144-X)
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