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3\left(x+3\right)=8-12x
Multiply both sides of the equation by 12, the least common multiple of 4,3.
3x+9=8-12x
Use the distributive property to multiply 3 by x+3.
3x+9+12x=8
Add 12x to both sides.
15x+9=8
Combine 3x and 12x to get 15x.
15x=8-9
Subtract 9 from both sides.
15x=-1
Subtract 9 from 8 to get -1.
x=\frac{-1}{15}
Divide both sides by 15.
x=-\frac{1}{15}
Fraction \frac{-1}{15} can be rewritten as -\frac{1}{15} by extracting the negative sign.