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(2/5)*x-3*x+7 = -82/5 // + -82/5
(2/5)*x-3*x-(-82/5)+7 = 0
(2/5)*x-3*x+82/5+7 = 0
117/5-13/5*x = 0 // - 117/5
-13/5*x = -117/5 // : -13/5
x = -117/5/(-13/5)
x = 9
x = 9
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