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3*x-(12/4) = 7*x-(13/6) // - 7*x-(13/6)
3*x-(7*x)-(12/4)+13/6 = 0
3*x-7*x+13/6-3 = 0
-4*x-5/6 = 0 // + 5/6
-4*x = 5/6 // : -4
x = 5/6/(-4)
x = -5/24
x = -5/24
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