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