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2*x+3 = (-1/2)*x-(1/2) // - (-1/2)*x-(1/2)
2*x-((-1/2)*x)+1/2+3 = 0
2*x+(1/2)*x+1/2+3 = 0
5/2*x+7/2 = 0 // - 7/2
5/2*x = -7/2 // : 5/2
x = -7/2/5/2
x = -7/5
x = -7/5
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