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x in (-oo:+oo)
(1/2)*x+x+x+5 = 50 // - 50
(1/2)*x+x+x-50+5 = 0
5/2*x-45 = 0 // + 45
5/2*x = 45 // : 5/2
x = 45/5/2
x = 18
x = 18
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