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(1/2)*x-3 = 5*x-(5/7) // - 5*x-(5/7)
(1/2)*x-(5*x)+5/7-3 = 0
(1/2)*x-5*x+5/7-3 = 0
-9/2*x-16/7 = 0 // + 16/7
-9/2*x = 16/7 // : -9/2
x = 16/7/(-9/2)
x = -32/63
x = -32/63
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