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-4-4x=12x+15
We move all terms to the left:
-4-4x-(12x+15)=0
We get rid of parentheses
-4x-12x-15-4=0
We add all the numbers together, and all the variables
-16x-19=0
We move all terms containing x to the left, all other terms to the right
-16x=19
x=19/-16
x=-1+3/16
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