Firstly, you would subtract 7 from both sides, leaving you with 3m=21. You would then divide by three in order to be left with total value of m. 3m divided by 3 is m. 21 divided by 3 is 7. Therefore m=7 :)
        
             
        
        
        
I hope this helps you 
4plumbers +5helpers =182
5plumbers +6helpers =224
-24plumbers -30helpers =1092
25plumbers+30helpers =1120
1plumbers =28
4.28+5helpers =182
5helpers =70
1helpers=14
        
             
        
        
        
Its C. 113 ft because the height and the perimider of the trinagle
        
             
        
        
        
You would have to make them all one form that is the same, for example if you wanted to find out if 80%, 0.75, 1/2 are the same you would have to change them into the same form. If you wanted to make them all decimals it would be 0.08, 0.75, 0.5, if you wanted to make them all percents it would be 80%, 75%, 50%, you wanted them all of be a fraction it would be 4/5, 3/4, and 1/2. I hope explained this well and this helped :)
-Madi
        
             
        
        
        
Distribute and you will find 6(3)+6(-y)=18+(-6y)=18-6y