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7.2 = x/2-5 // - x/2-5
5-(x/2)+7.2 = 0
12.2-1/2*x = 0 // - 12.2
-1/2*x = -12.2 // : -1/2
x = -12.2/(-1/2)
x = 24.4
x = 24.4
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