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5+7x-\left(4-7x\right)=0
Subtract 4 from 9 to get 5.
5+7x-4-\left(-7x\right)=0
To find the opposite of 4-7x, find the opposite of each term.
5+7x-4+7x=0
The opposite of -7x is 7x.
1+7x+7x=0
Subtract 4 from 5 to get 1.
1+14x=0
Combine 7x and 7x to get 14x.
14x=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-1}{14}
Divide both sides by 14.
x=-\frac{1}{14}
Fraction \frac{-1}{14} can be rewritten as -\frac{1}{14} by extracting the negative sign.