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x in (-oo:+oo)
X-x+2/5-(2/7) = 4 // - 4
X-x+2/5-(2/7)-4 = 0
X-x+2/5-2/7-4 = 0
X-x-136/35 = 0 // - X-136/35
-x = -(X-136/35) // * -1
x = X-136/35
x = X-136/35
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