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8x-5+4x=12-5
We move all terms to the left:
8x-5+4x-(12-5)=0
We add all the numbers together, and all the variables
8x+4x-5-7=0
We add all the numbers together, and all the variables
12x-12=0
We move all terms containing x to the left, all other terms to the right
12x=12
x=12/12
x=1
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