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s in (-oo:+oo)
(-15/28)*s = -9/10 // + -9/10
(-15/28)*s-(-9/10) = 0
(-15/28)*s+9/10 = 0
9/10-15/28*s = 0 // - 9/10
-15/28*s = -9/10 // : -15/28
s = -9/10/(-15/28)
s = 42/25
s = 42/25
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