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7*(4*x-(5*y)) = (10*x)/7 // - (10*x)/7
7*(4*x-(5*y))-((10*x)/7) = 0
7*(4*x-5*y)+(-10/7)*x = 0
7*(4*x-5*y)+(-10*x)/7 = 0
(7^2*(4*x-5*y))/7+(-10*x)/7 = 0
7^2*(4*x-5*y)-10*x = 0
186*x-245*y = 0
(186*x-245*y)/7 = 0
(186*x-245*y)/7 = 0 // * 7
186*x-245*y = 0
186*x-245*y = 0 // + -245*y
186*x = -(-245*y) // : 186
x = (-(-245*y))/186
x = (245*y)/186
x = (245*y)/186
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