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(7/10)*x-((1/4)*y) = 800 // - 800
(7/10)*x-((1/4)*y)-800 = 0
(7/10)*x+(-1/4)*y-800 = 0
7/10*x-1/4*y-800 = 0 // + -1/4*y-800
7/10*x = -(-1/4*y-800) // : 7/10
x = (-(-1/4*y-800))/7/10
x = 10/7*(800-(-1/4*y))
x = 10/7*(800-(-1/4*y))
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