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3+10+2x+9x=4x-1
We move all terms to the left:
3+10+2x+9x-(4x-1)=0
We add all the numbers together, and all the variables
11x-(4x-1)+13=0
We get rid of parentheses
11x-4x+1+13=0
We add all the numbers together, and all the variables
7x+14=0
We move all terms containing x to the left, all other terms to the right
7x=-14
x=-14/7
x=-2
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