42=2(1+6r)-4r

Solution for 42=2(1+6r)-4r equation:

42=2(1+6r)-4r

We move all terms to the left:

42-(2(1+6r)-4r)=0

We add all the numbers together, and all the variables

-(2(6r+1)-4r)+42=0


We calculate terms in parentheses: -(2(6r+1)-4r), so:

2(6r+1)-4r

We add all the numbers together, and all the variables

-4r+2(6r+1)

We multiply parentheses

-4r+12r+2

We add all the numbers together, and all the variables

8r+2

Back to the equation:

-(8r+2)


We get rid of parentheses

-8r-2+42=0

We add all the numbers together, and all the variables

-8r+40=0

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

-8r=-40

r=-40/-8

r=+5