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(2/3)*x+(2/5)*x+3/5 = 137/15 // - 137/15
(2/3)*x+(2/5)*x+3/5-(137/15) = 0
(2/3)*x+(2/5)*x+3/5-137/15 = 0
16/15*x-128/15 = 0 // + 128/15
16/15*x = 128/15 // : 16/15
x = 128/15/16/15
x = 8
x = 8
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