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x in (-oo:+oo)
7 = (42/3)*x // - (42/3)*x
7-((42/3)*x) = 0
7-14*x = 0
7-14*x = 0 // - 7
-14*x = -7 // : -14
x = -7/(-14)
x = 1/2
x = 1/2
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