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5x+15-3\left(x+2\right)=0
Use the distributive property to multiply 5 by x+3.
5x+15-3x-6=0
Use the distributive property to multiply -3 by x+2.
2x+15-6=0
Combine 5x and -3x to get 2x.
2x+9=0
Subtract 6 from 15 to get 9.
2x=-9
Subtract 9 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-9}{2}
Divide both sides by 2.
x=-\frac{9}{2}
Fraction \frac{-9}{2} can be rewritten as -\frac{9}{2} by extracting the negative sign.