3(x+1)+4x=20

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Solution for 3(x+1)+4x=20 equation: 



3(x+1)+4x=20

We move all terms to the left:

3(x+1)+4x-(20)=0

We add all the numbers together, and all the variables

4x+3(x+1)-20=0

We multiply parentheses

4x+3x+3-20=0

We add all the numbers together, and all the variables

7x-17=0

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

7x=17

x=17/7

x=2+3/7

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