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5-((1/3)*x) = 12*x // - 12*x
5-((1/3)*x)-(12*x) = 0
(-1/3)*x-12*x+5 = 0
5-37/3*x = 0 // - 5
-37/3*x = -5 // : -37/3
x = -5/(-37/3)
x = 15/37
x = 15/37
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