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(2*x)/5-(3/10) = x/4 // - x/4
(2*x)/5-(x/4)-(3/10) = 0
(2*x)/5-(x/4)-3/10 = 0
3/20*x-3/10 = 0 // + 3/10
3/20*x = 3/10 // : 3/20
x = 3/10/3/20
x = 2
x = 2
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