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3*x-(2/5) = 7*x-(1/4) // - 7*x-(1/4)
3*x-(7*x)-(2/5)+1/4 = 0
3*x-7*x-2/5+1/4 = 0
-4*x-3/20 = 0 // + 3/20
-4*x = 3/20 // : -4
x = 3/20/(-4)
x = -3/80
x = -3/80
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