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10x+2x+1=3x+19
We move all terms to the left:
10x+2x+1-(3x+19)=0
We add all the numbers together, and all the variables
12x-(3x+19)+1=0
We get rid of parentheses
12x-3x-19+1=0
We add all the numbers together, and all the variables
9x-18=0
We move all terms containing x to the left, all other terms to the right
9x=18
x=18/9
x=2
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