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