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15 = (5*x^1)/2 // - (5*x^1)/2
15-((5*x^1)/2) = 0
(-5/2)*x+15 = 0
15-5/2*x = 0 // - 15
-5/2*x = -15 // : -5/2
x = -15/(-5/2)
x = 6
x = 6
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