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104-7x+30=9x+42
We move all terms to the left:
104-7x+30-(9x+42)=0
We add all the numbers together, and all the variables
-7x-(9x+42)+134=0
We get rid of parentheses
-7x-9x-42+134=0
We add all the numbers together, and all the variables
-16x+92=0
We move all terms containing x to the left, all other terms to the right
-16x=-92
x=-92/-16
x=5+3/4
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