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0.666(9+x)=-12
We move all terms to the left:
0.666(9+x)-(-12)=0
We add all the numbers together, and all the variables
0.666(x+9)-(-12)=0
We add all the numbers together, and all the variables
0.666(x+9)+12=0
We multiply parentheses
0.666x+5.994+12=0
We add all the numbers together, and all the variables
0.666x+17.994=0
We move all terms containing x to the left, all other terms to the right
0.666x=-17.994
x=-17.994/0.666
x=-27+0.012/0.666
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