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15x-4=6x+9
We move all terms to the left:
15x-4-(6x+9)=0
We get rid of parentheses
15x-6x-9-4=0
We add all the numbers together, and all the variables
9x-13=0
We move all terms containing x to the left, all other terms to the right
9x=13
x=13/9
x=1+4/9
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