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18=9\left(x+3\right)
Variable x cannot be equal to -3 since division by zero is not defined. Multiply both sides of the equation by x+3.
18=9x+27
Use the distributive property to multiply 9 by x+3.
9x+27=18
Swap sides so that all variable terms are on the left hand side.
9x=18-27
Subtract 27 from both sides.
9x=-9
Subtract 27 from 18 to get -9.
x=\frac{-9}{9}
Divide both sides by 9.
x=-1
Divide -9 by 9 to get -1.