-5
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Yes that is correct
Taking it step by step: 2b - b - 10 = -13 b - 10 = -13 b = -13 + 10 b = - 3
This is the same as: 13-2b = 21 -2b = 21-13 -2b = 8 b = -4
4m - 8 = 6m =>4m - 6m = 8 => -2m = 8 => m = -(8/2) => m = -4
it is equal to +x