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(1/2)*x+7 = 3*x-10 // - 3*x-10
(1/2)*x-(3*x)+7+10 = 0
(1/2)*x-3*x+7+10 = 0
17-5/2*x = 0 // - 17
-5/2*x = -17 // : -5/2
x = -17/(-5/2)
x = 34/5
x = 34/5
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