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x in (-oo:+oo)
(1/2)*(2*x+7) = 6*x // - 6*x
(1/2)*(2*x+7)-(6*x) = 0
(1/2)*(2*x+7)-6*x = 0
1/2*(2*x+7)-6*x = 0
1/2*(2*x+7)-6*x = 0
7/2-5*x = 0
7/2-5*x = 0
7/2-5*x = 0 // - 7/2
-5*x = -7/2 // : -5
x = -7/2/(-5)
x = 7/10
x = 7/10
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