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(3/7)*x-x-5 = -159/35 // + -159/35
(3/7)*x-x-(-159/35)-5 = 0
(3/7)*x-x+159/35-5 = 0
-4/7*x-16/35 = 0 // + 16/35
-4/7*x = 16/35 // : -4/7
x = 16/35/(-4/7)
x = -4/5
x = -4/5
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