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-((6/7)*x)-5/3 = -5/21 // + -5/21
-((6/7)*x)-5/3-(-5/21) = 0
(-6/7)*x-5/3+5/21 = 0
-6/7*x-10/7 = 0 // + 10/7
-6/7*x = 10/7 // : -6/7
x = 10/7/(-6/7)
x = -5/3
x = -5/3
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