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-x-3(1-3x)=-21+2x
We move all terms to the left:
-x-3(1-3x)-(-21+2x)=0
We add all the numbers together, and all the variables
-x-3(-3x+1)-(2x-21)=0
We add all the numbers together, and all the variables
-1x-3(-3x+1)-(2x-21)=0
We multiply parentheses
-1x+9x-(2x-21)-3=0
We get rid of parentheses
-1x+9x-2x+21-3=0
We add all the numbers together, and all the variables
6x+18=0
We move all terms containing x to the left, all other terms to the right
6x=-18
x=-18/6
x=-3
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