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28*((6/7)*x-((1/4)*y)) = 0
28*((6/7)*x+(-1/4)*y) = 0
28*(6/7*x-1/4*y) = 0
6/7*x-1/4*y = 0 // + -1/4*y
6/7*x = -(-1/4*y) // : 6/7
x = (-(-1/4*y))/6/7
x = 7/24*y
x = 7/24*y
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