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x in (-oo:+oo)
X/7-(7/8) = x/5 // - x/5
X/7-(x/5)-(7/8) = 0
X/7-(x/5)-7/8 = 0
1/7*X-1/5*x-7/8 = 0 // - 1/7*X-7/8
-1/5*x = -(1/7*X-7/8) // : -1/5
x = (-(1/7*X-7/8))/(-1/5)
x = -5*(7/8-(1/7*X))
x = -5*(7/8-(1/7*X))
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