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x in (-oo:+oo)
x+x/2+(3*x)/5 = 21 // - 21
x+x/2+(3*x)/5-21 = 0
21/10*x-21 = 0 // + 21
21/10*x = 21 // : 21/10
x = 21/21/10
x = 10
x = 10
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