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x in (-oo:+oo)
x/3 = (4*x)/21+2 // - (4*x)/21+2
x/3-((4*x)/21)-2 = 0
x/3+(-4/21)*x-2 = 0
1/7*x-2 = 0 // + 2
1/7*x = 2 // : 1/7
x = 2/1/7
x = 14
x = 14
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