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