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x in (-oo:+oo)
x/3 = (4*x)/21+6 // - (4*x)/21+6
x/3-((4*x)/21)-6 = 0
x/3+(-4/21)*x-6 = 0
1/7*x-6 = 0 // + 6
1/7*x = 6 // : 1/7
x = 6/1/7
x = 42
x = 42
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