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4 = (-1/2)*(5*x-3) // - (-1/2)*(5*x-3)
4-((-1/2)*(5*x-3)) = 0
(1/2)*(5*x-3)+4 = 0
1/2*(5*x-3)+4 = 0
1/2*(5*x-3)+4 = 0
5/2*x+5/2 = 0
5/2*x+5/2 = 0
5/2*x+5/2 = 0 // - 5/2
5/2*x = -5/2 // : 5/2
x = -5/2/5/2
x = -1
x = -1
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