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7x+2(3-3x)=-1
We move all terms to the left:
7x+2(3-3x)-(-1)=0
We add all the numbers together, and all the variables
7x+2(-3x+3)-(-1)=0
We add all the numbers together, and all the variables
7x+2(-3x+3)+1=0
We multiply parentheses
7x-6x+6+1=0
We add all the numbers together, and all the variables
x+7=0
We move all terms containing x to the left, all other terms to the right
x=-7
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