You have to combine equal terms.
-5r-9s+9r+3s-6
= -5r+9r-9s+3s-6
= 4r-6s-6
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Combine the ' 9r ' and the ' -5r ' . Replace them with ' 4r '.
-9r plus 10r can be written as ( -9r + 10r) and the answer is r.
3+10-r+6r = -3+9r+0 13+5r = -3+9r 16 = 4r r = 4
9r-1?
9-4r