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3-((5/7)*x) = 46/7 // - 46/7
3-((5/7)*x)-(46/7) = 0
(-5/7)*x-46/7+3 = 0
-5/7*x-25/7 = 0 // + 25/7
-5/7*x = 25/7 // : -5/7
x = 25/7/(-5/7)
x = -5
x = -5
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