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