3(x-40)=100-x

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Solution for 3(x-40)=100-x equation: 



3(x-40)=100-x

We move all terms to the left:

3(x-40)-(100-x)=0

We add all the numbers together, and all the variables

3(x-40)-(-1x+100)=0

We multiply parentheses

3x-(-1x+100)-120=0

We get rid of parentheses

3x+1x-100-120=0

We add all the numbers together, and all the variables

4x-220=0

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

4x=220

x=220/4

x=55

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