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x in (-oo:+oo)
7 = (1/2)*(6*x-4) // - (1/2)*(6*x-4)
7-((1/2)*(6*x-4)) = 0
(-1/2)*(6*x-4)+7 = 0
7-1/2*(6*x-4) = 0
7-1/2*(6*x-4) = 0
9-3*x = 0
9-3*x = 0
9-3*x = 0 // - 9
-3*x = -9 // : -3
x = -9/(-3)
x = 3
x = 3
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