4.2=r/2-3.5

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Solution for 4.2=r/2-3.5 equation: 



4.2=r/2-3.5

We move all terms to the left:

4.2-(r/2-3.5)=0

We get rid of parentheses

-r/2+3.5+4.2=0

We multiply all the terms by the denominator


-r+(3.5)*2+(4.2)*2=0

We add all the numbers together, and all the variables

-1r+15.4=0

We move all terms containing r to the left, all other terms to the right

-r=-15.4

r=-15.4/-1

r=15+0.4/1

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