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2*x-((9/2)*x)-(5*x)+3 = 0
2*x+(-9/2)*x-5*x+3 = 0
3-15/2*x = 0 // - 3
-15/2*x = -3 // : -15/2
x = -3/(-15/2)
x = 2/5
x = 2/5
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