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130=9x+13
We move all terms to the left:
130-(9x+13)=0
We get rid of parentheses
-9x-13+130=0
We add all the numbers together, and all the variables
-9x+117=0
We move all terms containing x to the left, all other terms to the right
-9x=-117
x=-117/-9
x=+13
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