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7(3-6x)=-21
We move all terms to the left:
7(3-6x)-(-21)=0
We add all the numbers together, and all the variables
7(-6x+3)-(-21)=0
We add all the numbers together, and all the variables
7(-6x+3)+21=0
We multiply parentheses
-42x+21+21=0
We add all the numbers together, and all the variables
-42x+42=0
We move all terms containing x to the left, all other terms to the right
-42x=-42
x=-42/-42
x=1
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