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(7m-21)+(m+9)=15
We simplify the equation to the form, which is simple to understand
(7m-21)+(m+9)=15
Remove unnecessary parentheses
7m-21+(m+9)=15
Remove unnecessary parentheses
+7m-21+m+9=+15
We move all terms containing m to the left and all other terms to the right.
+7m+1m=+15+21-9
We simplify left and right side of the equation.
+8m=+27
We divide both sides of the equation by 8 to get m.
m=3.375
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