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x in (-oo:+oo)
(1/3)*x+(1/5)*x+(1/6)*x = 21 // - 21
(1/3)*x+(1/5)*x+(1/6)*x-21 = 0
7/10*x-21 = 0 // + 21
7/10*x = 21 // : 7/10
x = 21/7/10
x = 30
x = 30
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