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X/7-1 = x/7 // - x/7
X/7-(x/7)-1 = 0
1/7*X-1/7*x-1 = 0 // - 1/7*X-1
-1/7*x = -(1/7*X-1) // : -1/7
x = (-(1/7*X-1))/(-1/7)
x = -7*(1-(1/7*X))
x = -7*(1-(1/7*X))
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