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y in (-oo:+oo)
6*y-((18/7)*y)-21 = 0
6*y+(-18/7)*y-21 = 0
24/7*y-21 = 0 // + 21
24/7*y = 21 // : 24/7
y = 21/24/7
y = 49/8
y = 49/8
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