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(1/2)*x-((5/4)*y) = -10 // + 10
(1/2)*x-((5/4)*y)+10 = 0
(1/2)*x+(-5/4)*y+10 = 0
1/2*x-5/4*y+10 = 0 // - 10-5/4*y
1/2*x = -(10-5/4*y) // : 1/2
x = (-(10-5/4*y))/1/2
x = -2*(10-5/4*y)
x = -2*(10-5/4*y)
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