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x in (-oo:+oo)
-42 = (7/9)*x // - (7/9)*x
-((7/9)*x)-42 = 0
(-7/9)*x-42 = 0
-7/9*x-42 = 0 // + 42
-7/9*x = 42 // : -7/9
x = 42/(-7/9)
x = -54
x = -54
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