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(-2/5)*x-(((5/3)/5)*x)+7 = 0
(-2/5)*x+(-1/3)*x+7 = 0
7-11/15*x = 0 // - 7
-11/15*x = -7 // : -11/15
x = -7/(-11/15)
x = 105/11
x = 105/11
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