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33=-3(-21-x)+3(x-4)
We move all terms to the left:
33-(-3(-21-x)+3(x-4))=0
We add all the numbers together, and all the variables
-(-3(-1x-21)+3(x-4))+33=0
We calculate terms in parentheses: -(-3(-1x-21)+3(x-4)), so:We get rid of parentheses
-3(-1x-21)+3(x-4)
We multiply parentheses
3x+3x+63-12
We add all the numbers together, and all the variables
6x+51
Back to the equation:
-(6x+51)
-6x-51+33=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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