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(-5/2)*(6*x+24)-15 = 0
-5/2*(6*x+24)-15 = 0
-5/2*(6*x+24)-15 = 0
-15*x-75 = 0
-15*x-75 = 0
-15*x-75 = 0 // + 75
-15*x = 75 // : -15
x = 75/(-15)
x = -5
x = -5
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