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X in (-oo:+oo)
0 = (6/7)*X-21 // - (6/7)*X-21
0-((6/7)*X)+21 = 0
(-6/7)*X+0+21 = 0
21-6/7*X = 0 // - 21
-6/7*X = -21 // : -6/7
X = -21/(-6/7)
X = 49/2
X = 49/2
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