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(1/2)*x-(5*y) = 10 // - 10
(1/2)*x-(5*y)-10 = 0
(1/2)*x-5*y-10 = 0
1/2*x-5*y-10 = 0 // + -5*y-10
1/2*x = -(-5*y-10) // : 1/2
x = (-(-5*y-10))/1/2
x = 2*(10-(-5*y))
x = 2*(10-(-5*y))
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