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15x-49=9x-31
We move all terms to the left:
15x-49-(9x-31)=0
We get rid of parentheses
15x-9x+31-49=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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