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(-1/2)*x+7 = 73/10 // - 73/10
(-1/2)*x-(73/10)+7 = 0
(-1/2)*x-73/10+7 = 0
-1/2*x-3/10 = 0 // + 3/10
-1/2*x = 3/10 // : -1/2
x = 3/10/(-1/2)
x = -3/5
x = -3/5
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