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-((7/2)*x)-7 = -12 // + 12
12-((7/2)*x)-7 = 0
(-7/2)*x-7+12 = 0
5-7/2*x = 0 // - 5
-7/2*x = -5 // : -7/2
x = -5/(-7/2)
x = 10/7
x = 10/7
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