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x in (-oo:+oo)
8.75 = x/7 // - x/7
8.75-(x/7) = 0
8.75-1/7*x = 0 // - 8.75
-1/7*x = -8.75 // : -1/7
x = -8.75/(-1/7)
x = 61.25000123
x = 61.25000123
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