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8x+21=10x-1=7x-6
We move all terms to the left:
8x+21-(10x-1)=0
We get rid of parentheses
8x-10x+1+21=0
We add all the numbers together, and all the variables
-2x+22=0
We move all terms containing x to the left, all other terms to the right
-2x=-22
x=-22/-2
x=+11
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