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-120-9x=105+6x
We move all terms to the left:
-120-9x-(105+6x)=0
We add all the numbers together, and all the variables
-9x-(6x+105)-120=0
We get rid of parentheses
-9x-6x-105-120=0
We add all the numbers together, and all the variables
-15x-225=0
We move all terms containing x to the left, all other terms to the right
-15x=225
x=225/-15
x=-15
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