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6x-x+52=-9+21
We move all terms to the left:
6x-x+52-(-9+21)=0
We add all the numbers together, and all the variables
6x-x+52-12=0
We add all the numbers together, and all the variables
5x+40=0
We move all terms containing x to the left, all other terms to the right
5x=-40
x=-40/5
x=-8
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