1/2(4r+12)-7r=21

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Solution for 1/2(4r+12)-7r=21 equation: 



1/2(4r+12)-7r=21

We move all terms to the left:

1/2(4r+12)-7r-(21)=0



Domain of the equation: 2(4r+12)!=0

r∈R



We add all the numbers together, and all the variables

-7r+1/2(4r+12)-21=0

We multiply all the terms by the denominator


-7r*2(4r+12)-21*2(4r+12)+1=0

Wy multiply elements

-14r^2(4-42r(4+1=0

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