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x in (-oo:+oo)
x = (5/3)*(72-x) // - (5/3)*(72-x)
x-((5/3)*(72-x)) = 0
(-5/3)*(72-x)+x = 0
x-5/3*(72-x) = 0
x-5/3*(72-x) = 0
8/3*x-120 = 0
8/3*x-120 = 0
8/3*x-120 = 0 // + 120
8/3*x = 120 // : 8/3
x = 120/8/3
x = 45
x = 45
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