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-((3/7)*x)-3 = x-(61/7) // - x-(61/7)
61/7-((3/7)*x)-x-3 = 0
(-3/7)*x-x+61/7-3 = 0
40/7-10/7*x = 0 // - 40/7
-10/7*x = -40/7 // : -10/7
x = -40/7/(-10/7)
x = 4
x = 4
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