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-((4/7)*x)-5/3 = 5/21 // - 5/21
-((4/7)*x)-5/3-(5/21) = 0
(-4/7)*x-5/3-5/21 = 0
-4/7*x-40/21 = 0 // + 40/21
-4/7*x = 40/21 // : -4/7
x = 40/21/(-4/7)
x = -10/3
x = -10/3
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