(r+120)*(1.5)+r*(1.5)=1620

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Solution for (r+120)*(1.5)+r*(1.5)=1620 equation: 



(r+120)(1.5)+r(1.5)=1620

We move all terms to the left:

(r+120)(1.5)+r(1.5)-(1620)=0

We multiply parentheses

(r+120)(1.5)+1.5r-1620=0

We multiply parentheses ..

(+1.5r+180)+1.5r-1620=0

We add all the numbers together, and all the variables

(1.5r+180)+1.5r-1620=0

We add all the numbers together, and all the variables

1.5r+(1.5r+180)-1620=0

We get rid of parentheses

1.5r+1.5r+180-1620=0

We add all the numbers together, and all the variables

3r-1440=0

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

3r=1440

r=1440/3

r=480

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