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y in (-oo:+oo)
(-5/7)*y = -1/2 // + -1/2
(-5/7)*y-(-1/2) = 0
(-5/7)*y+1/2 = 0
1/2-5/7*y = 0 // - 1/2
-5/7*y = -1/2 // : -5/7
y = -1/2/(-5/7)
y = 7/10
y = 7/10
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