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y in (-oo:+oo)
(-7/12)*y = -1/5 // + -1/5
(-7/12)*y-(-1/5) = 0
(-7/12)*y+1/5 = 0
1/5-7/12*y = 0 // - 1/5
-7/12*y = -1/5 // : -7/12
y = -1/5/(-7/12)
y = 12/35
y = 12/35
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