You can add, subtract, multiply, or divide both sides of the equation or inequality by the same number. Don't multiply or divide by zero. In the case of an inequality, if you multiply or divide by a negative number, the sign of the inequality must be reversed. E.g., if you multiply both sides by -2, a "less-than" sign should be replaced by a "greater-than" sign.
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The method is the same.
The solution is the coordinates of the point where the graphs of the equations intersect.
When solving equations remember that whatever operations are performed on the LHS of the equation must be performed on its RHS to keep the equation in balance.
The order of operations relate to solving multi-step equations because you are following the order of operations just in a backwards way.
5-7m+9m=11