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120 = (4*(2*x-1))/2 // - (4*(2*x-1))/2
120-((4*(2*x-1))/2) = 0
120-2*(2*x-1) = 0
120-2*(2*x-1) = 0
122-4*x = 0
122-4*x = 0
122-4*x = 0 // - 122
-4*x = -122 // : -4
x = -122/(-4)
x = 61/2
x = 61/2
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