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5*x = (1/2)*(16-(8*y)) // - (1/2)*(16-(8*y))
5*x-((1/2)*(16-(8*y))) = 0
(-1/2)*(16-8*y)+5*x = 0
5*x-1/2*(16-8*y) = 0
5*x-1/2*(16-8*y) = 0
5*x+4*y-8 = 0
5*x+4*y-8 = 0
5*x+4*y-8 = 0 // - 4*y-8
5*x = -(4*y-8) // : 5
x = (-(4*y-8))/5
x = (8-(4*y))/5
x = (8-(4*y))/5
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