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20/3 = 7*x-5*x+5 // - 7*x-5*x+5
20/3-(-5*x)-(7*x)-5 = 0
5*x-7*x+20/3-5 = 0
5/3-2*x = 0 // - 5/3
-2*x = -5/3 // : -2
x = -5/3/(-2)
x = 5/6
x = 5/6
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