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(5/4)*x-((1/6)*x)+4 = (8/10)*x // - (8/10)*x
(5/4)*x-((1/6)*x)-((8/10)*x)+4 = 0
(5/4)*x+(-1/6)*x+(-4/5)*x+4 = 0
17/60*x+4 = 0 // - 4
17/60*x = -4 // : 17/60
x = -4/17/60
x = -240/17
x = -240/17
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