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(2*x)/5 = 7*x-(4/10) // - 7*x-(4/10)
(2*x)/5-(7*x)+4/10 = 0
(2*x)/5-7*x+4/10 = 0
2/5-33/5*x = 0 // - 2/5
-33/5*x = -2/5 // : -33/5
x = -2/5/(-33/5)
x = 2/33
x = 2/33
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