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x in (-oo:+oo)
X/4-3 = x/7+5 // - x/7+5
X/4-(x/7)-5-3 = 0
1/4*X-1/7*x-8 = 0 // - 1/4*X-8
-1/7*x = -(1/4*X-8) // : -1/7
x = (-(1/4*X-8))/(-1/7)
x = -7*(8-(1/4*X))
x = -7*(8-(1/4*X))
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