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