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(1/3)*x+(1/5)*x+4 = x // - x
(1/3)*x+(1/5)*x-x+4 = 0
4-7/15*x = 0 // - 4
-7/15*x = -4 // : -7/15
x = -4/(-7/15)
x = 60/7
x = 60/7
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