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(1/2)*x+7*x+7/10 = 191/5 // - 191/5
(1/2)*x+7*x+7/10-(191/5) = 0
(1/2)*x+7*x+7/10-191/5 = 0
15/2*x-75/2 = 0 // + 75/2
15/2*x = 75/2 // : 15/2
x = 75/2/15/2
x = 5
x = 5
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