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10*(4*x-((18/10)*x)-20)+7*x-((14/5)*x) = 0
10*(4*x+(-9/5)*x-20)+7*x+(-14/5)*x = 0
10*(11/5*x-20)+7*x+(-14*x)/5 = 0
(5*10*(11/5*x-20))/5+(5*7*x)/5+(-14*x)/5 = 0
5*10*(11/5*x-20)+5*7*x-14*x = 0
145*x-14*x-1000 = 0
131*x-1000 = 0
(131*x-1000)/5 = 0
(131*x-1000)/5 = 0 // * 5
131*x-1000 = 0
131*x-1000 = 0 // + 1000
131*x = 1000 // : 131
x = 1000/131
x = 1000/131
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