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(1/5)*x+(1/4)*x+2/5 = 13/10 // - 13/10
(1/5)*x+(1/4)*x+2/5-(13/10) = 0
(1/5)*x+(1/4)*x+2/5-13/10 = 0
9/20*x-9/10 = 0 // + 9/10
9/20*x = 9/10 // : 9/20
x = 9/10/9/20
x = 2
x = 2
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