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(5x-4)+8x=12x+15
We move all terms to the left:
(5x-4)+8x-(12x+15)=0
We add all the numbers together, and all the variables
8x+(5x-4)-(12x+15)=0
We get rid of parentheses
8x+5x-12x-4-15=0
We add all the numbers together, and all the variables
x-19=0
We move all terms containing x to the left, all other terms to the right
x=19
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