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7*x-(8*y)+3/5+512 = (5*x)/10 // - (5*x)/10
7*x-((5*x)/10)-(8*y)+3/5+512 = 0
7*x+(-1/2)*x-8*y+3/5+512 = 0
13/2*x-8*y+2563/5 = 0 // - 2563/5-8*y
13/2*x = -(2563/5-8*y) // : 13/2
x = (-(2563/5-8*y))/13/2
x = -2/13*(2563/5-8*y)
x = -2/13*(2563/5-8*y)
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