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y in (-oo:+oo)
(1/4)*y-7 = (1/7)*y // - (1/7)*y
(1/4)*y-((1/7)*y)-7 = 0
(1/4)*y+(-1/7)*y-7 = 0
3/28*y-7 = 0 // + 7
3/28*y = 7 // : 3/28
y = 7/3/28
y = 196/3
y = 196/3
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