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x in (-oo:+oo)
-((7/3)*x) = 42 // - 42
-((7/3)*x)-42 = 0
(-7/3)*x-42 = 0
-7/3*x-42 = 0 // + 42
-7/3*x = 42 // : -7/3
x = 42/(-7/3)
x = -18
x = -18
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