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(1/5)*x+(2/3)*x+5 = 251/45 // - 251/45
(1/5)*x+(2/3)*x-(251/45)+5 = 0
(1/5)*x+(2/3)*x-251/45+5 = 0
13/15*x-26/45 = 0 // + 26/45
13/15*x = 26/45 // : 13/15
x = 26/45/13/15
x = 2/3
x = 2/3
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