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x in (-oo:+oo)
-((3/7)*x) = 21 // - 21
-((3/7)*x)-21 = 0
(-3/7)*x-21 = 0
-3/7*x-21 = 0 // + 21
-3/7*x = 21 // : -3/7
x = 21/(-3/7)
x = -49
x = -49
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