Hey!
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Steps to Solve:
8 + (-3m) = 26
~Subtract 8 to both sides
8 + (-3m) - 8 = 26 - 8
~Simplify
-3m = 18
~Divide -3 to both sides
-3m/-3 = 18/-3
~Simplify
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Hope This Helped! Good Luck!