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x in (-oo:+oo)
X+(1/3)*x = 140 // - 140
X+(1/3)*x-140 = 0
X+1/3*x-140 = 0 // - X-140
1/3*x = -(X-140) // : 1/3
x = (-(X-140))/1/3
x = 3*(140-X)
x = 3*(140-X)
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