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x in (-oo:+oo)
e^7*x+7 = 8/7 // - 8/7
e^7*x-(8/7)+7 = 0
e^7*x-8/7+7 = 0
e^7*x+41/7 = 0 // - 41/7
e^7*x = -41/7 // : e^7
x = -41/7/(e^7)
x = -41/7/(e^7)
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