4x+3(21-x)=75

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Solution for 4x+3(21-x)=75 equation: 



4x+3(21-x)=75

We move all terms to the left:

4x+3(21-x)-(75)=0

We add all the numbers together, and all the variables

4x+3(-1x+21)-75=0

We multiply parentheses

4x-3x+63-75=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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