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X(7X-7)=(7X+5)(X-2)
We move all terms to the left:
X(7X-7)-((7X+5)(X-2))=0
We multiply parentheses
7X^2-7X-((7X+5)(X-2))=0
We multiply parentheses ..
7X^2-((+7X^2-14X+5X-10))-7X=0
We calculate terms in parentheses: -((+7X^2-14X+5X-10)), so:We add all the numbers together, and all the variables
(+7X^2-14X+5X-10)
We get rid of parentheses
7X^2-14X+5X-10
We add all the numbers together, and all the variables
7X^2-9X-10
Back to the equation:
-(7X^2-9X-10)
7X^2-7X-(7X^2-9X-10)=0
We get rid of parentheses
7X^2-7X^2-7X+9X+10=0
We add all the numbers together, and all the variables
2X+10=0
We move all terms containing X to the left, all other terms to the right
2X=-10
X=-10/2
X=-5
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