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15x-206=6x+55
We move all terms to the left:
15x-206-(6x+55)=0
We get rid of parentheses
15x-6x-55-206=0
We add all the numbers together, and all the variables
9x-261=0
We move all terms containing x to the left, all other terms to the right
9x=261
x=261/9
x=29
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