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x in (-oo:+oo)
x/6 = 7/2 // - 7/2
x/6-(7/2) = 0
x/6-7/2 = 0
1/6*x-7/2 = 0 // + 7/2
1/6*x = 7/2 // : 1/6
x = 7/2/1/6
x = 21
x = 21
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