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3x-5=-9x+15
We move all terms to the left:
3x-5-(-9x+15)=0
We get rid of parentheses
3x+9x-15-5=0
We add all the numbers together, and all the variables
12x-20=0
We move all terms containing x to the left, all other terms to the right
12x=20
x=20/12
x=1+2/3
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