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X/7-(x/7) = 3 // - 3
X/7-(x/7)-3 = 0
1/7*X-1/7*x-3 = 0 // - 1/7*X-3
-1/7*x = -(1/7*X-3) // : -1/7
x = (-(1/7*X-3))/(-1/7)
x = -7*(3-(1/7*X))
x = -7*(3-(1/7*X))
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