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3/5-(7*x) = 3*x-(12/5) // - 3*x-(12/5)
3/5-(7*x)-(3*x)+12/5 = 0
3/5-7*x-3*x+12/5 = 0
3-10*x = 0 // - 3
-10*x = -3 // : -10
x = -3/(-10)
x = 3/10
x = 3/10
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