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12 = (7/2)*x-2 // - (7/2)*x-2
2-((7/2)*x)+12 = 0
(-7/2)*x+2+12 = 0
14-7/2*x = 0 // - 14
-7/2*x = -14 // : -7/2
x = -14/(-7/2)
x = 4
x = 4
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