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y in (-oo:+oo)
(1/4)*y-(3/7) = (1/7)*y-(9/4) // - (1/7)*y-(9/4)
(1/4)*y-((1/7)*y)-(3/7)+9/4 = 0
(1/4)*y+(-1/7)*y-3/7+9/4 = 0
3/28*y+51/28 = 0 // - 51/28
3/28*y = -51/28 // : 3/28
y = -51/28/3/28
y = -17
y = -17
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