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7*x+4/5 = 8*x+2/5 // - 8*x+2/5
7*x-(8*x)+4/5-(2/5) = 0
7*x-8*x+4/5-2/5 = 0
2/5-x = 0 // - 2/5
-x = -2/5 // * -1
x = 2/5
x = 2/5
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