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x in (-oo:+oo)
(6/7)*x = 3^2+3 // - 3^2+3
(6/7)*x-3^2-3 = 0
6/7*x-12 = 0 // + 12
6/7*x = 12 // : 6/7
x = 12/6/7
x = 14
x = 14
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