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