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224=5x-7(-4x+1)
We move all terms to the left:
224-(5x-7(-4x+1))=0
We calculate terms in parentheses: -(5x-7(-4x+1)), so:We get rid of parentheses
5x-7(-4x+1)
We multiply parentheses
5x+28x-7
We add all the numbers together, and all the variables
33x-7
Back to the equation:
-(33x-7)
-33x+7+224=0
We add all the numbers together, and all the variables
-33x+231=0
We move all terms containing x to the left, all other terms to the right
-33x=-231
x=-231/-33
x=+7
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