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39+7x=0
Add 3 and 36 to get 39.
7x=-39
Subtract 39 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-39}{7}
Divide both sides by 7.
x=-\frac{39}{7}
Fraction \frac{-39}{7} can be rewritten as -\frac{39}{7} by extracting the negative sign.