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12x-6x=4+15
We move all terms to the left:
12x-6x-(4+15)=0
We add all the numbers together, and all the variables
12x-6x-19=0
We add all the numbers together, and all the variables
6x-19=0
We move all terms containing x to the left, all other terms to the right
6x=19
x=19/6
x=3+1/6
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