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-3(7x-1)=-144
We move all terms to the left:
-3(7x-1)-(-144)=0
We add all the numbers together, and all the variables
-3(7x-1)+144=0
We multiply parentheses
-21x+3+144=0
We add all the numbers together, and all the variables
-21x+147=0
We move all terms containing x to the left, all other terms to the right
-21x=-147
x=-147/-21
x=+7
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