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13-((5/4)*x) = -2 // + 2
2-((5/4)*x)+13 = 0
(-5/4)*x+2+13 = 0
15-5/4*x = 0 // - 15
-5/4*x = -15 // : -5/4
x = -15/(-5/4)
x = 12
x = 12
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