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13-((2/5)*x) = -3 // + 3
3-((2/5)*x)+13 = 0
(-2/5)*x+3+13 = 0
16-2/5*x = 0 // - 16
-2/5*x = -16 // : -2/5
x = -16/(-2/5)
x = 40
x = 40
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