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5x+15-7\left(x+2\right)=0
Use the distributive property to multiply 5 by x+3.
5x+15-7x-14=0
Use the distributive property to multiply -7 by x+2.
-2x+15-14=0
Combine 5x and -7x to get -2x.
-2x+1=0
Subtract 14 from 15 to get 1.
-2x=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-1}{-2}
Divide both sides by -2.
x=\frac{1}{2}
Fraction \frac{-1}{-2} can be simplified to \frac{1}{2} by removing the negative sign from both the numerator and the denominator.