(x+6+3 \left( -x-6 \right) = 0
Solve for x
x=-6
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x+6+3\left(-x\right)-18=0
Use the distributive property to multiply 3 by -x-6.
x-12+3\left(-x\right)=0
Subtract 18 from 6 to get -12.
x+3\left(-x\right)=12
Add 12 to both sides. Anything plus zero gives itself.
x-3x=12
Multiply 3 and -1 to get -3.
-2x=12
Combine x and -3x to get -2x.
x=\frac{12}{-2}
Divide both sides by -2.
x=-6
Divide 12 by -2 to get -6.
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