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21x-12+8x=10x+9
We move all terms to the left:
21x-12+8x-(10x+9)=0
We add all the numbers together, and all the variables
29x-(10x+9)-12=0
We get rid of parentheses
29x-10x-9-12=0
We add all the numbers together, and all the variables
19x-21=0
We move all terms containing x to the left, all other terms to the right
19x=21
x=21/19
x=1+2/19
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