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x in (-oo:+oo)
5*h+7*h+1/2 = x // - x
5*h+7*h-x+1/2 = 0
12*h-x+1/2 = 0 // - 12*h+1/2
-x = -(12*h+1/2) // * -1
x = 12*h+1/2
x = 12*h+1/2
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