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(4/5)*x-((2/15)*x) = x-(3/7) // - x-(3/7)
(4/5)*x-((2/15)*x)-x+3/7 = 0
(4/5)*x+(-2/15)*x-x+3/7 = 0
3/7-1/3*x = 0 // - 3/7
-1/3*x = -3/7 // : -1/3
x = -3/7/(-1/3)
x = 9/7
x = 9/7
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