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