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5*x-((8/3)*y) = 1 // - 1
5*x-((8/3)*y)-1 = 0
5*x+(-8/3)*y-1 = 0
5*x-8/3*y-1 = 0 // + -8/3*y-1
5*x = -(-8/3*y-1) // : 5
x = (-(-8/3*y-1))/5
x = (1-(-8/3*y))/5
x = (1-(-8/3*y))/5
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