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2.5x+8.6x=-67.71
We move all terms to the left:
2.5x+8.6x-(-67.71)=0
We add all the numbers together, and all the variables
11.1x+67.71=0
We move all terms containing x to the left, all other terms to the right
11.1x=-67.71
x=-67.71/11.1
x=-6+1/10
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