need help with -2(3s-5)-10=-3(9s+4)-3

Im trying to figure out how .... -15 divided by 3 equals a fraction. -7/5
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-2(3s - 5) - 10 = -3(9s + 4) - 3
-6s + 10 - 10 = -27s - 12 - 3 {used distributive property}
-6s = -27s - 15 {combined like terms}
21s = -15 {added 27s to both sides}
s = -15/21 {divided both sides by 21}
s = -5/7 {reduced}
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