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x in (-oo:+oo)
42 = (7/6)*x // - (7/6)*x
42-((7/6)*x) = 0
(-7/6)*x+42 = 0
42-7/6*x = 0 // - 42
-7/6*x = -42 // : -7/6
x = -42/(-7/6)
x = 36
x = 36
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