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(5/4)*x+1/2 = (2/5)*x-(1/10)+4 // - (2/5)*x-(1/10)+4
(5/4)*x-((2/5)*x)+1/2+1/10-4 = 0
(5/4)*x+(-2/5)*x+1/2+1/10-4 = 0
17/20*x-17/5 = 0 // + 17/5
17/20*x = 17/5 // : 17/20
x = 17/5/17/20
x = 4
x = 4
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