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(1/4)*x-(2*y) = 10 // - 10
(1/4)*x-(2*y)-10 = 0
(1/4)*x-2*y-10 = 0
1/4*x-2*y-10 = 0 // + -2*y-10
1/4*x = -(-2*y-10) // : 1/4
x = (-(-2*y-10))/1/4
x = 4*(10-(-2*y))
x = 4*(10-(-2*y))
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