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10x+9=12x+5
We move all terms to the left:
10x+9-(12x+5)=0
We get rid of parentheses
10x-12x-5+9=0
We add all the numbers together, and all the variables
-2x+4=0
We move all terms containing x to the left, all other terms to the right
-2x=-4
x=-4/-2
x=+2
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