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x in (-oo:+oo)
(1*x)/3 = 40 // - 40
(1*x)/3-40 = 0
x/3-40 = 0
1/3*x-40 = 0 // + 40
1/3*x = 40 // : 1/3
x = 40/1/3
x = 120
x = 120
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