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