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(1/15)*x = 9/10-((3/5)*x) // - 9/10-((3/5)*x)
(1/15)*x+(3/5)*x-(9/10) = 0
(1/15)*x+(3/5)*x-9/10 = 0
2/3*x-9/10 = 0 // + 9/10
2/3*x = 9/10 // : 2/3
x = 9/10/2/3
x = 27/20
x = 27/20
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