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9x+4x+100=12x-5
We move all terms to the left:
9x+4x+100-(12x-5)=0
We add all the numbers together, and all the variables
13x-(12x-5)+100=0
We get rid of parentheses
13x-12x+5+100=0
We add all the numbers together, and all the variables
x+105=0
We move all terms containing x to the left, all other terms to the right
x=-105
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