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(1/3)*x-25 = 2*x-4 // - 2*x-4
(1/3)*x-(2*x)-25+4 = 0
(1/3)*x-2*x-25+4 = 0
-5/3*x-21 = 0 // + 21
-5/3*x = 21 // : -5/3
x = 21/(-5/3)
x = -63/5
x = -63/5
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