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258=15x+120
We move all terms to the left:
258-(15x+120)=0
We get rid of parentheses
-15x-120+258=0
We add all the numbers together, and all the variables
-15x+138=0
We move all terms containing x to the left, all other terms to the right
-15x=-138
x=-138/-15
x=9+1/5
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