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x in (-oo:+oo)
(5/9)*x+2 = -7 // + 7
(5/9)*x+2+7 = 0
5/9*x+9 = 0 // - 9
5/9*x = -9 // : 5/9
x = -9/5/9
x = -81/5
x = -81/5
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