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x in (-oo:+oo)
(-7/9)*x = 49/15 // - 49/15
(-7/9)*x-(49/15) = 0
(-7/9)*x-49/15 = 0
-7/9*x-49/15 = 0 // + 49/15
-7/9*x = 49/15 // : -7/9
x = 49/15/(-7/9)
x = -21/5
x = -21/5
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