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122=4x+5x
We move all terms to the left:
122-(4x+5x)=0
We add all the numbers together, and all the variables
-(+9x)+122=0
We get rid of parentheses
-9x+122=0
We move all terms containing x to the left, all other terms to the right
-9x=-122
x=-122/-9
x=13+5/9
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