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7-((5*x)/2) = 1 // - 1
7-((5*x)/2)-1 = 0
(-5/2)*x-1+7 = 0
6-5/2*x = 0 // - 6
-5/2*x = -6 // : -5/2
x = -6/(-5/2)
x = 12/5
x = 12/5
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