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(1/4)*x-(2*y) = -3/4 // + -3/4
(1/4)*x-(2*y)-(-3/4) = 0
(1/4)*x-2*y+3/4 = 0
1/4*x-2*y+3/4 = 0 // - 3/4-2*y
1/4*x = -(3/4-2*y) // : 1/4
x = (-(3/4-2*y))/1/4
x = -4*(3/4-2*y)
x = -4*(3/4-2*y)
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