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-7(9+3x)=-189
We move all terms to the left:
-7(9+3x)-(-189)=0
We add all the numbers together, and all the variables
-7(3x+9)-(-189)=0
We add all the numbers together, and all the variables
-7(3x+9)+189=0
We multiply parentheses
-21x-63+189=0
We add all the numbers together, and all the variables
-21x+126=0
We move all terms containing x to the left, all other terms to the right
-21x=-126
x=-126/-21
x=+6
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