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(4/5)*x-((10/2)*x)-6-3 = 0
(4/5)*x-5*x-6-3 = 0
-21/5*x-9 = 0 // + 9
-21/5*x = 9 // : -21/5
x = 9/(-21/5)
x = -15/7
x = -15/7
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