-3(x-1)+7x=21

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Solution for -3(x-1)+7x=21 equation: 



-3(x-1)+7x=21

We move all terms to the left:

-3(x-1)+7x-(21)=0

We add all the numbers together, and all the variables

7x-3(x-1)-21=0

We multiply parentheses

7x-3x+3-21=0

We add all the numbers together, and all the variables

4x-18=0

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

4x=18

x=18/4

x=4+1/2

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