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(4.2x)=(2x.x-4)
We move all terms to the left:
(4.2x)-((2x.x-4))=0
We add all the numbers together, and all the variables
(+4.2x)-((2x.x-4))=0
We get rid of parentheses
4.2x-((2x.x-4))=0
We calculate terms in parentheses: -((2x.x-4)), so:We get rid of parentheses
(2x.x-4)
We get rid of parentheses
2x.x-4
Back to the equation:
-(2x.x-4)
4.2x-2x.x+4=0
We move all terms containing x to the left, all other terms to the right
4.2x-2x.x=-4
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