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1-((2*x)/40)-(5/40) = x-((4*x)/10)-(7/10) // - x-((4*x)/10)-(7/10)
(4*x)/10-((2*x)/40)-x-(5/40)+7/10+1 = 0
(-1/20)*x-x+(4*x)/10-1/8+7/10+1 = 0
63/40-13/20*x = 0 // - 63/40
-13/20*x = -63/40 // : -13/20
x = -63/40/(-13/20)
x = 63/26
x = 63/26
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