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(7/10)*x-((1/4)*x) = 800 // - 800
(7/10)*x-((1/4)*x)-800 = 0
(7/10)*x+(-1/4)*x-800 = 0
9/20*x-800 = 0 // + 800
9/20*x = 800 // : 9/20
x = 800/9/20
x = 16000/9
x = 16000/9
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