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