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x in (-oo:+oo)
(1/2)*(6*x+7) = 3*x // - 3*x
(1/2)*(6*x+7)-(3*x) = 0
(1/2)*(6*x+7)-3*x = 0
1/2*(6*x+7)-3*x = 0
1/2*(6*x+7)-3*x = 0
7/2 = 0
7/2 = 0
7/2 = 0 // * 2
7 = 0
x belongs to the empty set
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