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30x+5=9x+100
We move all terms to the left:
30x+5-(9x+100)=0
We get rid of parentheses
30x-9x-100+5=0
We add all the numbers together, and all the variables
21x-95=0
We move all terms containing x to the left, all other terms to the right
21x=95
x=95/21
x=4+11/21
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