3(4.2+2r)=1.2(2.5-5r)

Solution for 3(4.2+2r)=1.2(2.5-5r) equation:

3(4.2+2r)=1.2(2.5-5r)

We move all terms to the left:

3(4.2+2r)-(1.2(2.5-5r))=0

We add all the numbers together, and all the variables

3(2r+4.2)-(1.2(-5r+2.5))=0

We multiply parentheses

6r-(1.2(-5r+2.5))+12.6=0


We calculate terms in parentheses: -(1.2(-5r+2.5)), so:

1.2(-5r+2.5)

We multiply parentheses

-6r+3

Back to the equation:

-(-6r+3)


We get rid of parentheses

6r+6r-3+12.6=0

We add all the numbers together, and all the variables

12r+9.6=0

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

12r=-9.6

r=-9.6/12

r=-2.6666666666667/3.3333333333333