3(5x+20)=140

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Solution for 3(5x+20)=140 equation: 



3(5x+20)=140

We move all terms to the left:

3(5x+20)-(140)=0

We multiply parentheses

15x+60-140=0

We add all the numbers together, and all the variables

15x-80=0

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

15x=80

x=80/15

x=5+1/3

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