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(3x+7)2-84x=(3x-7)2
We move all terms to the left:
(3x+7)2-84x-((3x-7)2)=0
We add all the numbers together, and all the variables
-84x+(3x+7)2-((3x-7)2)=0
We multiply parentheses
-84x+6x-((3x-7)2)+14=0
We calculate terms in parentheses: -((3x-7)2), so:We add all the numbers together, and all the variables
(3x-7)2
We multiply parentheses
6x-14
Back to the equation:
-(6x-14)
-78x-(6x-14)+14=0
We get rid of parentheses
-78x-6x+14+14=0
We add all the numbers together, and all the variables
-84x+28=0
We move all terms containing x to the left, all other terms to the right
-84x=-28
x=-28/-84
x=1/3
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