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-12x+15x=80-30-10
We move all terms to the left:
-12x+15x-(80-30-10)=0
We add all the numbers together, and all the variables
-12x+15x-40=0
We add all the numbers together, and all the variables
3x-40=0
We move all terms containing x to the left, all other terms to the right
3x=40
x=40/3
x=13+1/3
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