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x in (-oo:+oo)
(2/9)*x+13 = (7/9)*x-37 // - (7/9)*x-37
(2/9)*x-((7/9)*x)+13+37 = 0
(2/9)*x+(-7/9)*x+13+37 = 0
50-5/9*x = 0 // - 50
-5/9*x = -50 // : -5/9
x = -50/(-5/9)
x = 90
x = 90
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