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-((1/2)*x)-7/4 = 0
(-1/2)*x-7/4 = 0
-1/2*x-7/4 = 0 // + 7/4
-1/2*x = 7/4 // : -1/2
x = 7/4/(-1/2)
x = -7/2
x = -7/2
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