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x in (-oo:+oo)
x/3-(2/1) = 5 // - 5
x/3-(2/1)-5 = 0
x/3-5-2 = 0
1/3*x-7 = 0 // + 7
1/3*x = 7 // : 1/3
x = 7/1/3
x = 21
x = 21
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