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(5/4)*x-((1/2)*y) = 7/8 // - 7/8
(5/4)*x-((1/2)*y)-(7/8) = 0
(5/4)*x+(-1/2)*y-7/8 = 0
5/4*x-1/2*y-7/8 = 0 // + -1/2*y-7/8
5/4*x = -(-1/2*y-7/8) // : 5/4
x = (-(-1/2*y-7/8))/5/4
x = 4/5*(7/8-(-1/2*y))
x = 4/5*(7/8-(-1/2*y))
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