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