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x in (-oo:+oo)
42 = (2/7)*x // - (2/7)*x
42-((2/7)*x) = 0
(-2/7)*x+42 = 0
42-2/7*x = 0 // - 42
-2/7*x = -42 // : -2/7
x = -42/(-2/7)
x = 147
x = 147
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