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12x-2.3x=-206
We move all terms to the left:
12x-2.3x-(-206)=0
We add all the numbers together, and all the variables
9.7x+206=0
We move all terms containing x to the left, all other terms to the right
9.7x=-206
x=-206/9.7
x=-21+2.3/9.7
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